Definition of drop outs:
(v) :
(idiomatic) To leave (school, a race, etc.) prematurely and voluntarily.
(v) :
To opt out of conventional society.
(v) :
(of sound, electronic signal, etc.) To be lost or momentarily interrupted.
(v) :
(transitive, slang) To dismiss, break up with or abandon (someone).
(v) :
(intransitive, Of a trapdoor or similar) To give way under someone.
(v) :
(intransitive, Of the ground, floor, snow, etc., or figuratively, a worldview or foundation) To cause someone to slip and/or fall down.