a forced or fake smile/laughter; a smile produced to be polite or hide true feelings.
上司の冗談に作り笑いを浮かべるのがつらかった。
It was hard to force a smile at my boss's joke.
彼女の作り笑いはすぐにバレてしまった。
Her forced smile was quickly seen through.
面接では作り笑いにならないように自然に振る舞うことが大切だ。
In interviews it's important to act naturally so your smile doesn't come across as forced.