feel free

feel around

To gather information sneakily; to seek out information without revealing that one is actively searching for it.

feel for

To experience sympathy for, to sympathise with.

feel one's way

To do by guesswork, erring on the side of caution.

feel out

To attempt to ascertain a person's point of view, or the nature of a situation, by cautious and subtle means.

feel someone's collar

To arrest someone.

feel the pinch

To suffer a hardship, especially significant financial pressure.

feel up

To grope someone, especially someone's breasts, in a sexual manner.

free hand

Synonym of free rein.