fool around
phrasal verb with fool verb uk/fuːl/ us/fuːl/
(UK also fool about)
(SILLY)
干蠢事，瞎弄，乱弄（尤指可能带来危险的后果）
to behave in a silly way, especially in a way that might have dangerous results
Don't fool around with matches. 不要摆弄火柴。
(FUNNY)
耍活宝，搞笑
to behave in a humorous way in order to make other people laugh
He's always getting into trouble for fooling around in class. 他老是因为在课堂上捣乱搞笑而惹麻烦。
(NOT USEFUL)
虚度光阴，闲荡
to spend your time doing nothing useful
We spent the afternoon fooling around on the beach. 我们在海滩上闲荡了一个下午。
(HAVE A SEXUAL RELATIONSHIP)
mainly US（已婚人士与他人）关系暧昧
If a married person fools around, they have a sexual relationship with someone who is not their husband or wife.
She'd been fooling around with someone at work. 她和某个同事关系暧昧。