to push or fold (something) into a confined or hidden place or between two surfaces
He tucked the letter under the book
to push (something or the loose or stray parts of something) into a more secure or tidy position or state
She tucked her hair under her hat
(+ in/up) to settle (somebody or oneself) in a comfortable position esp in bed and usu by securing bedclothes under the mattress
to draw or gather (something, esp one's legs) into a folded position
to stitch a flattened fold in (fabric or a garment), esp as a decorative finish or to improve the fit
to fit snugly
The stool tucks neatly under the table
tuck into
to start eating (food) with enjoyment
Old English tūcian to ill-treat, in Middle English to pluck or pull, hence to pull or gather cloth into folds (15th cent.). This gave rise from the 16th cent. onwards to various senses expressing the idea of folding or putting away