expression, ichidan verb
chime in; interject; put in a word or gesture
Used when someone adds a comment, quip, or gesture during a pause in conversation, music, or performance. Often light or supportive, not a rude interruption.
彼の話に合いの手を入れて、場を和ませた。
I chimed in during his story and lightened the mood.
演
It's common for the audience to interject during a performance.