cheekn.[OE. cheke, cheoke, AS. cece, cece; cf. Goth. kukjan to kiss, D. kaak cheek; perh. akin to E. chew, jaw.]1. The side of the face below the eye.()2. The cheek bone.(Caucer.)3. (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. The branches of a bridle bit.(Knight.)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.()Cheek of beef. See Illust. of Beef. -- 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 (Zol.), 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.()v. t. To be impudent or saucy to.()