intransitive. To come to agreement or accord, make up one's differences; (also) to become friends with someone. Now rare.

Of persons: To do with, put up with (a thing); to agree, ‘hit it’, rub on (with a person).

to hit it. (Now usually to hit it off.) To agree. Also more widely, to become friendly, to be on good terms.

To agree, to fraternize. Const. together, with, rarely in. cotton up: to make friendly advances, ‘make up’ to, strike up a friendship.

intransitive. Scottish. To begin to associate or keep company with a person; to enter into relations with. Also of two people: to become…

to hit it. (Now usually to hit it off.) To agree. Also more widely, to become friendly, to be on good terms.