ream2Pronunciation: /riːm/Translate ream | into Spanish Definition of ream verb [with object] 1widen (a hole) with a special tool: a fan which has a small enough hole to be reamed out to the correct size widen a bore or hole in (a gun or other metal object) with a special tool: the rods were marked out, drilled, and reamed North American clear out or remove (material) from something: pierce, probe, and ream out the bony chambers of the crab’s body 2North American informal rebuke (someone) fiercely:the agent reamed him out for walking away from the deal 3North American vulgar slang have anal intercourse with. Phrases ream someone's ass (or butt) North American vulgar slang criticize or rebuke someone. Origin: early 19th century: of unknown originream in other Oxford dictionaries Definition of ream in the US English dictionary