To miss school, play truant, play hooky.
To crash or glitch.
To leave (a place) hastily.
To abandon someone without warning.
To freak out, to go crazy, e.g. from worry.
To cause to bulge.
A rapid retreat, a rout.
To skive; to fail to attend school when required to do so.
Used other than figuratively or idiomatically: see sag, off.
To back off from an opponent against whom one is defending.
To move too far leeward when sailing on the wind.
To fall in share price.