(Irregular plural: bogeymen).
An imaginary monster used to frighten children; SYN. bugbear, bugaboo, boogeyman, booger.

Spectre; bugbear; goblin.

Dialect British; goblin, specter; also; an object of fear or loathing

An unidentified (and possibly enemy) aircraft; SYN. bogie, bogey.

1. An imaginary goblin or specter used to excite fear
2. An object or source of dread; a continuing source of irritation; problem