Cheek n. 1.The side of the face below the eye.
3.pl. (Mech.) 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.
4.pl. The branches of a bridle bit.
5.(Founding) A section of a flask, so made that it can be moved laterally, to permit the removal of the pattern from the mold; the middle part of a flask.
6.Cool confidence; assurance; impudence. (Slang)
Cheek bone (Anat.) the bone of the side of the face; esp., the malar bone.
Cheek by jowl, side by side; very intimate.
Cheek pouch (Zool.), a sacklike dilation of the cheeks of certain monkeys and rodents, used for holding food.
Cheeks of a block, the two sides of the shell of a tackle block.
Cheeks of a mast, the projection on each side of a mast, upon which the trestletrees rest.
Cheek tooth (Anat.), a hinder or molar tooth.
Butment cheek. See under Butment. 
