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Definition of backside

backside

/ˈbækˌsaɪd/
back · side

Plural:backsides
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backside Lexical Profile

backside Game Scores & Validity

• noun

1

A person's buttocks or rump (used informally).

Example

"He slipped on the icy pavement and landed squarely on his backside."


2

North American The rear, reverse, or opposite side or surface of an object or place.

Example

"Please write your contact information on the backside of the registration form."

Synonyms
View all synonyms for backside

Word Nuance & Usage

When spelled as one word ('backside'), it most commonly refers informally to the human buttocks, though in American English it is also frequently used for the rear surface of an object; in formal writing, the two-word phrase 'back side' is preferred when referring to the rear of an object.

• Rhymes for backside

Word Origin & Etymology

Formed in late Middle English as a compound of 'back' and 'side', originally referring simply to the rear part of anything before acquiring its anatomical sense in the 16th century.

Cite this Entry


Wordmom. (2026). Definition of Backside. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/backside
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