noun
servile smile; sycophantic laugh
A smile or laugh intended to flatter or curry favor with someone, often insincere.
上司の冗談に追従笑いをするのは疲れる。
It's tiring to give a sycophantic laugh at the boss's jokes.
彼の追従笑いにはうんざりだ。
I'm fed up with his servile smile.