風任せ

風任せ(かぜまかせ) (kaze-makase)

Literal meaning: leaving it to the wind.
Figurative meaning: being worry-free, going with the flow, leaving things to the course of events.
Example: 船(ふね)は帆(ほ)任せ(まかせ)、帆(ほ)は風(かぜ)任せ(まかせ)