verb · to leave a stable job or a government position to go into private business or the commercial sector

他放弃了铁饭碗，决定下海经商。

verb · to enter the sex trade or become a prostitute

在那个动荡的年代，不少女性被迫下海谋生。

verb · to go out to sea or enter the water for activities such as swimming, fishing, or sailing

今天风浪太大，所有的渔船都不能下海。