EDIT: Oh, I just read in your replies that your answer did not actually get marked wrong and you did get the shake animation. In that case you can ignore my post.
Old post
This feature was added over a year ago:
I have tested it just now and it seems to work for me:
However, I also came across a case where it didn’t work: when I answered “be stormy” for 荒れる it was accepted with the message that my answer was a bit off.
It seems that there are still some bugs in this feature.