IDIOM ►

Hang in there

Meaning 1
to stay with something
Sentence 1
Hang in there. The sea is rough.
Meaning 2
to persist in doing something, to stay with something
Sentence 2
Hang in there. Staying on a low fat diet is no fun.

Derivation

The sailor, wind surfer, glider counterbalances the angle of the boat, surfboard, windsurfer by hanging out over the water.