fall off

verbs

come off
"This button had fallen off"
fall off
is a type of (narrower)
come to be detached
"His retina detached and he had to be rushed into surgery"
come away, come off, detach
fall heavily or suddenly; decline markedly
"The real estate market fell off"
fall off, sink, slump
is derived from
falloff
diminish in size or intensity
fall away, fall off
is derived from
falloff