cheek 
/ˈtʃi:k/ noun
plural cheeks /ˈtʃi:k/ noun 1 [count] : the part of the face that is below the eye and to the side of the nose and mouth
▪ rosy/chubby cheeks ▪ He kissed her on the cheek. ▪ They were sitting/dancing/posing cheek to cheek. [=with their cheeks touching] — see picture at face; see also tongue in cheek 2 Brit : an attitude or way of behaving that is rude and does not show proper respect [noncount] ▪ He had the cheek [=nerve] to complain that our gift was cheap. [singular] ▪ He's got a cheek ignoring us like that. 3 [count] informal : one of the two parts of the body that a person sits on : buttocks
▪ rosy/chubby cheeks ▪ He kissed her on the cheek. ▪ They were sitting/dancing/posing cheek to cheek. [=with their cheeks touching] — see picture at face; see also tongue in cheek
cheek by jowl
: very close together
▪ We sat cheek by jowl [=side by side] with the city's elite. ▪ cheap knickknacks displayed cheek by jowl with fine antiques
▪ We sat cheek by jowl [=side by side] with the city's elite. ▪ cheap knickknacks displayed cheek by jowl with fine antiques
turn the other cheek
: to choose not to try to hurt or insult someone who has hurt or insulted you
