back
How to Use Back
Learner’s notesIn plain EnglishThe rear part of the body or an object; also, to support something, or to move in reverse.
Don't confuse the verb sense "to back someone" (support) with "to back out" (withdraw) — they mean nearly opposite things.
Word Forms
more back comparative, further back comparative, farther back comparative, backed past tense, backs plural, backs singular, most back superlative, furthest back superlative, farthest back superlative
Fill the Gap
Can you complete this real example?
He threw his _____ out lifting the sofa.
Etymology
From Old English bæc, of ancient Germanic origin, ultimately possibly related to a root meaning "to bend."