Cheek
CHEEK, noun
1. The side of the face below the eyes on each side.
2. Among mechanics, cheeks are those pieces of a machine which form corresponding sides, or which are double and alike; as the cheeks of a printing press, which stand perpendicular and support the three sommers, the head, shelves and winter; the cheeks of a turners lathe; the cheeks of a glaziers vise; the cheeks of a mortar, and of a gun-carriage; the cheeks of a mast, which serve to sustain the trestle trees, etc.
CHEEK by jowl, closeness, proximity.