Here’s what Claude says, take it with a grain of salt:
The many lives of 申
The short answer is that 申 has three layers of meaning, each historically distinct, and the monkey connection is primarily phonetic — but with some intriguing circumstantial reinforcement, and possibly deeper phonological roots across language families.
Layer 1: The original pictograph — lightning
In oracle bone script, 申 resembles a zigzagging lightning bolt, clearly depicting its connection to lightning. Reference: Learn the 130 pictographs that shaped the ancient China's world - Decode Mandarin Chinese . This is widely agreed upon by paleographers. Paleographers interpret the oracle script of 申 as a pictograph of a “lightning bolt”, graphically differentiated from 電 (diàn, “lightning; electricity”) by the addition of a cloud radical, and from 神 (shén, “spirit; deity”) by the addition of a worship radical. Reference: Chinese mythology: Shen (Chinese religion)
So 申 is the original form of both 電 and 神 — the lightning bolt was the ur-character, from which “electricity” and “spirit/god” later branched off as specialized derivatives. This makes sense culturally: lightning descending from the sky evokes both raw electrical power and divine presence.
Layer 2: The Earthly Branch — “extend / stretch”
This is where the story gets interesting, because the word shen meaning “to extend, stretch out” is a phonetic loan (jiǎjiè 假借) — the character was borrowed to write a completely different word that happened to sound similar, much as English speakers might write “too” for “two” in a pinch.
The “extend” sense derives from 引 (OC *linʔ, *lins, “to pull; to draw”) with a devoicing causative or iterative, according to Schuessler (2007). Reference: 申 - Wiktionary, the free dictionary . The visual logic of a lightning bolt extending/branching out across the sky may have helped the semantic borrowing feel natural, but the primary driver was phonological — shen (申) sounded like shen (伸, “to stretch”), so the character got borrowed.
The character 申 combined the “altar/worship radical” 礻in 神, and serves as a phonetic element in many related characters: 伸 “stretch”, 紳 “official’s sash”, 呻 “chant, drone”, and 砷 “arsenic”. Blogger The whole cluster is essentially a phonetic family around a root idea of pulling/extending.
The meaning “to state, to express, to report” follows naturally from “extend” — you extend/convey your words upward to a superior. This verb is still very common in formal/literary Chinese and Japanese (申し上げる mōshiageru, “to humbly say”).
Layer 3: The Earthly Branch Monkey — and is the connection phonetic?
Here is the crux of your question. The twelve Earthly Branches (子丑寅卯辰巳午未申酉戌亥) are an ancient ordinal system — essentially “slot 9 in a sequence of 12.” Archaeologists found oracle bone evidence of the complete sexagenary cycle dating back to around 1000 BCE, used by Shang rulers as a calendrical system. Reference: Heavenly Stems and Earthly Branches: Origin and Charts . The branches originally had nothing inherently to do with animals.
The animal associations came later, and the scholarly consensus is that they were added as mnemonics — a concrete way for ordinary people to remember an abstract sequence. Some historians believe the zodiac animals were designed to help people remember the order of the Earthly Branches; there is a mnemonic that Chinese children learn even before the multiplication table that pairs the branches with the matching zodiac animals. Chinese New Year
So why the monkey specifically for slot 9 (申)?
The primary link is phonetic, but it runs deeper than just Chinese. Wiktionary’s entry on 申 notes something striking: for the association of 申 (shēn) with the monkey, compare Proto-Tai *liːŋᴬ (“monkey”), Proto-Hmongic *ʔlinᴬ (“monkey”), and Proto-Mienic *ʔbiŋᴬ (“monkey”). Wiktionary This suggests that the Old Chinese reconstruction of shen (something like *hlin) may have been phonologically close to words meaning “monkey” across several neighboring language families — implying the association may reflect genuine areal phonological overlap, not just an arbitrary mnemonic choice.
There is also a folk-cosmological rationale layered on top. The “extend” sense was used to denote the moon’s “extending” phase — i.e., a waxing half-moon with a concave edge — according to Smith (2010). Wiktionary And there is a saying that during the Shen hour (15:00–17:00), when the sun is westward, monkeys like to cry and jump around with their long arms extended, so people associate the Shen time with the monkey being most active. Reference: Chinese Zodiac Monkey -Years, Traits, Horoscope, Lucy Signs . This is probably post-hoc rationalization — a folk etymology constructed after the pairing was already established — but it shows how the “extending” meaning of 申 was narratively reconciled with monkeys by pointing to their outstretched limbs.
Which meaning is oldest?
The order is fairly clear:
- Lightning pictograph — oldest, from oracle bone script (~1200 BCE or earlier). This is the original graphic meaning.
- Earthly Branch (slot 9 ordinal) — also very old, attested in oracle bones, used as a pure cyclical label with no inherent semantic content. The character was likely borrowed phonetically for this function.
- “Extend / stretch / express” — a phonetic loan, also ancient, but secondary to the lightning pictogram.
- Monkey — latest. The animal attributions to the Earthly Branches appear to have solidified during the Han dynasty (206 BCE–220 CE) or possibly the late Zhou, long after the branch system itself was established.
Summary
申 started as a picture of a forked lightning bolt. Because it sounded like the word shen “to stretch/extend,” it was borrowed for that verb and for the abstract ordinal “Branch 9.” The monkey entered much later, when the twelve branches were paired with animals as a mnemonic device — and the phonological fit between Old Chinese *hlin and neighboring languages’ words for “monkey” suggests the choice wasn’t purely arbitrary. The “stretching arms” story is almost certainly a later folk etymology that works backward from the coincidence of the pairings to construct a satisfying explanation.