But·ment n.
 1. Arch. A buttress of an arch; the supporter, or that part which joins it to the upright pier.
 2. Masonry The mass of stone or solid work at the end of a bridge, by which the extreme arches are sustained, or by which the end of a bridge without arches is supported.
 Butment cheek Carp., the part of a mortised timber surrounding the mortise, and against which the shoulders of the tenon bear.

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 Cheek n.
 1. The side of the face below the eye.
 2. The cheek bone. [Obs.]
 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 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 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.