<p><strong>Verb</strong></p><ul><li>(used with object) to put into a small, close, or concealing place: Tuck the money into your wallet.</li><li>to thrust in the loose end or edge of (a garment, covering, etc.) so as to hold closely in place (usually followed by in, up, under, etc.): Tuck in your blouse.</li><li>to cover snugly in or as if in this manner: She tucked the children into bed.</li><li>to pull up into a fold or folds; draw up into a folded arrangement (usually followed by in, up, etc.): to tuck up one's skirts; to tuck one's knees under one's chin.</li><li>Needlework: to sew tucks in.</li><li>to pass (a strand) above or below another one.</li><li>Informal: to eat or drink (usually followed by in, away, etc.): He tucked away a big meal.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to draw together; contract; pucker.</li><li>Needlework: to make tucks.</li><li>to fit securely or snugly: a bed that tucks into the corner.</li><li>to secure one's penis between one's legs so that the crotch is flat, often done by gender-diverse people as part of their gender expression: When I'm performing, I usually tuck, because it makes me feel more confident.</li></ul><p><strong>Noun</strong></p><ul><li>something tucked or folded in.</li><li>Sewing: a fold, or one of a series of folds, made by doubling cloth upon itself and stitching parallel with the edge of the fold, used for decoration or for shortening or fitting a garment.</li><li>Diving, Gymnastics: a body position in which the head is lowered and the thighs held against the chest with the knees bent and the arms locked around the shins.</li><li>Skiing: a crouch in which the ski poles are held close to the chest, extending back under the arms and parallel to the ground, as to maximize speed downhill.</li><li>Informal: a plastic surgery operation: a tummy tuck.</li><li>Nautical: the part of a vessel where the after ends of the outside planking or plating unite at the sternpost.</li><li>(in tying knots) the operation of passing one strand above or below another.</li><li>British Slang: food.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>to eat with gusto: We tucked into a roast beef dinner.</li></ul>