A fold sewn into fabric for shaping or decoration, as in dressmaking.
I put a tuck into the waist of the skirt.
This skirt has fine tucks.
A body position with knees drawn up to the chest, used in diving and gymnastics.
Practice the tuck position for diving.
He tucked his body and did a somersault.
tuck in
pin tuck
tuck top box; tuck case
Borrowed from English 'tuck'.