Definition of slip
a
slippery smoothness; "he could
feel the slickness of the tiller"
the act of avoiding
capture (especially by cunning)
(verb)
move stealthily; "The
ship slipped
away in the darkness"
get worse; "My grades are slipping"
pass on stealthily; "He slipped me the key when
nobody was looking"
move easily; "slip into something comfortable"