sea legs

US /ˈsiː leɡz/
UK /ˈsiː leɡz/
"sea legs" picture
1.

the ability to keep one's balance and not feel seasick when on a ship or boat

:
It took him a few days to get his sea legs on the cruise.
After a week at sea, everyone had their sea legs.
2.

the ability to adapt to a new or challenging situation

:
After starting his new job, he quickly got his sea legs and became productive.
It takes time to get your sea legs in a new culture.