noun back·side \-ˌsīd\

: the part of the body that a person sits on

Full Definition of BACKSIDE

:  buttocks —often used in plural

Examples of BACKSIDE

  1. <our backsides were sore after sitting on those hard benches for so long>

First Known Use of BACKSIDE

circa 1500

Related to BACKSIDE

BACKSIDE Defined for Kids


noun back·side \ˈbak-ˌsīd\

Definition of BACKSIDE for Kids

:  rump 1 <… the black pup came toward her, his fat backside swinging as he trotted … — Jean Craighead George, Julie of the Wolves>
:  the part of the body on which a person sits
Medical Dictionary


noun back·side \-ˌsīd\

Medical Definition of BACKSIDE

:  buttocks—often used in plural


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