Used other than figuratively or idiomatically: see sag, off.
To back off from an opponent against whom one is defending.
To skive; to fail to attend school when required to do so.
To move too far leeward when sailing on the wind.
To fall in share price.
To swing from side to side, such as of an animal's tail, or someone's head, to express disagreement or disbelief.
To play truant from school.
A witty person.
An oscillating movement.