Designating the side of the body toward the west when one is facing north; the side of the body on which the heart is located in most humans; the opposite of right. This arrow points to the reader's left: ←
Designating the bank of a river (etc.) on one's left when facing downstream (i.e. facing forward while floating with the current); that is, the north bank of a river that flows eastward. If this arrow: ⥲ shows the direction of the current, the tilde is on the left side of the river.
Left-wing; pertaining to the political left.

The left side or direction.
The left-wing political parties as a group; citizens holding left-wing views as a group.
The left hand or fist.
A punch delivered with the left fist.
A wave breaking from left to right (viewed from the shore).

simple past and past participle of leave (“depart, separate from; (cause or allow to) remain”).

simple past and past participle of leave (“permit”).