(1):

(v. t.) To breathe out; to exhale.

(2):

(v. t.) To breathe in and out; to inspire and expire,, as air; to breathe.

(3):

(v. i.) To breathe; to inhale air into the lungs, and exhale it from them, successively, for the purpose of maintaining the vitality of the blood.

(4):

(v. i.) To take breath again; hence, to take rest or refreshment.