(good) time to quit; (right) time to withdraw; time to pull out; time to retire; time to leave

decline; degeneration; decay; waning; ebbing

curing illness

eviction

decline (in prosperity)

retirement; resignation

retirement

evacuation; withdrawal; revocation; repeal; retreat

to resign; to retire; to quit; to leave (one's job, etc.)

withdrawal (e.g. from an organization); secession; leaving; pulling out

backspace (key)

leaving school during a term