From Middle English cheeke, cheke, cheoke, choke, from Old English ċēce, ċēace, ċēoce (“cheek; jaw”), from Proto-Germanic *kekǭ, *kēkǭ, *kakǭ, *kaukǭ, *keukǭ (“jaw; palate; pharynx”), from Proto-Indo-European *ǵyewh₁- (“to chew”). Cognate with Saterland Frisian Sooke (“cheek”), West Frisian tsjeak (“jaw”), Dutch kaak (“jaw; cheek”), Swedish käke (“jaw; jowl”), Norwegian kjake (“jaw”), Old Norse kók (“mouth; gullet”).
cheek (plural cheeks)
- (anatomy) The soft skin on each side of the face, below the eyes; the outer surface of the sides of the oral cavity.
- (anatomy, informal, usually in the plural) A buttock.
- (informal, uncountable) Impudence.
- You’ve got some cheek, asking me for money!
- (biology, informal) One of the genae, flat areas on the sides of a trilobite's cephalon.
- One of the pieces of a machine, or of timber or stonework, that form corresponding sides or a similar pair.
- the cheeks of a vice; the cheeks of a gun carriage
- (in the plural) The branches of a bridle bit.
- (Can we find and add a quotation of Knight to this entry?)
- (metalworking) The middle section of a flask, made so that it can be moved laterally, to permit the removal of the pattern from the mould.
- (side of the face): wang
- (buttock): arsecheek, asscheek, butt cheek, nether cheek
- (impudence): impertinence, impudence, brass neck (slang), nerve (informal), sass (informal, especially US)
- (gena): gena
- To be impudent towards.
- 1942, Emily Carr, The Book of Small, "Sunday," 
- We did not like him much because he kissed us and was preachy when we cheeked pretty Tallie, who did not rule over us as Dede did […]
- Don't cheek me, you little rascal!
- 1942, Emily Carr, The Book of Small, "Sunday,"