Main entry: operate, run, work, go, function
Definition: perform as expected when applied
Usage: The washing machine won't go unless it's plugged in; Does this old car still run well?; This old radio doesn't work anymore
Antonyms: malfunction, misfunction
Definition: fail to function or function improperly
Main entry: lock, mesh, operate, engage
Definition: keep engaged
Usage: engaged the gears
Definition: release from something that holds fast, connects, or entangles