Cheek

[Sarah]

Those pieces of a machine, or of any timber, or stone work,which form corresponding sides, or which are similar and in pair; as,the cheeks (jaws) of a vise; the cheeks of a gun carriage, etc.

[Sarah]

A British word for someone who disrespects and talks back to you. To give cheek.

[Justin Bieber]

rubbing of ones cheek to another persons cheek to display affection. Sparks fly when it happens. Lotion recommended for extra softness.

Caution: possible acne may occur

[Britney]

A ghetto term for [sex] or [ass] thats often times used in the sense of having sex. The term directly refers to her ass-cheek.

[Jessica]

To kiss some one on the cheek in saying goodbye to that person. Said mostly to friends (usually between females) or family members.

[Justin Bieber]

one part of a persons ass

[Julian]

Either side of the face below the eye.

[PussyCat]

[Newtons] lesser known, recently rediscovered 69th Law: skin and other non bone tissues with the ability to freely [oscillate] at a certain arbitrary finite speed; also a [sine] function because said cheek is put in motion from a state of rest and starts at the origin: (0,0)