“back”

At or near the rear.

To take a less aggressive position in a conflict than one previously had, or has planned to have.

To purchase (something already sold, misplaced, destroyed, or given away).

to repress; to struggle to repress.

To return to a prior state.

To retract or withdraw (an earlier statement).

To reverse direction and retrace one's steps.

Belonging to; possessed; acquired and designated by; proper to; property of; titled to; held in one's name; under/using the name of. Often marks a possessive determiner as reflexive, referring back to the subject of the clause or sentence.

Another time: indicating a repeat of an action.

In a contrary direction to.

To help keep from falling.

A bounding straight edge of a two-dimensional shape.

Transient visual content or media, processed with technology, especially electronic.

A person, typically someone other than a family member, spouse or lover, whose company one enjoys and towards whom one feels affection.

At or to the back or far side of.

To come or go back (to a place or person).

To bribe, especially to deter oversight.

To submit something; to give.