He laughed assent. 他一笑表示同意
laugh away 对(问题等)一笑置之;在笑声中消磨(时间)
laugh down 用笑声打断[拒绝]
laugh off 以笑来驱除(不愉快等);对…付之一笑
laugh sb out of the house 用嘲笑把某人赶出屋子
laugh sb out of his belief [habit] 嘲笑某人使其放弃信念[习惯]
laugh sb to scorn 【古】 嘲笑某人
laugh out of court.

He laughs best who laughs last.=He who laughs last laughs longest. 【谚】 谁笑在最后,笑得最好(最后的胜利,才是真正的胜利)
Laugh and grow [be] fat. 【谚】 笑得多胖得快(心宽体胖)
Laugh and the world laughs with you, weep and you weep alone. 【谚】 欢笑,世界伴你欢笑;哭泣,独自向隅而泣(福至人共享,祸来自承当)
burst out laughing 放声大笑
laugh in sb's face 当面嘲笑某人
laugh over 笑着谈论
laugh out 哈哈大笑
Don't make me laugh. 【口】 [iron.] 别让我笑掉牙,别开玩笑了.

burst [break] into a laugh 突然笑起来
give a laugh 大笑一声
have a good [hearty] laugh 尽情[痛快]地笑<at,aboul,over>
raise a laugh 引起笑声
good for a laugh 能引人发笑
That's a laugh. 简直是笑话!
for laughs 【口】 借以开心,为了取乐.