To raise or lift one's chin, often as a gesture of defiance or confidence. She chinned up defiantly, refusing to back down from the argument.
To perform a chin-up exercise, where one pulls themselves up using their arms until their chin is above a bar. He chinned himself several times during his workout routine.
To strike or punch someone on the chin. The boxer chinned his opponent with a quick uppercut.
To chat or converse in an informal or idle manner. They spent the afternoon chinning about their school days.