Dictionary

Someone who sleeps.

Example: I'm a light sleeper: I get woken up by the smallest of sounds.

That which lies dormant, as a law.

A spy, saboteur, or terrorist who lives unobtrusively in a community until activated by a prearranged signal; may be part of a sleeper cell.

A small starter earring, worn to prevent a piercing from closing.

A railroad tie.

A structural beam in a floor running perpendicular to both the joists beneath and floorboards above.

A heavy floor timber in a ship's bottom.

The lowest, or bottom, tier of casks.