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.
ignore, shrug (off)
To play truant from (school).
to avoid working
An avalanche, mudslide, or a like slumping of material or debris.