tuck means: This technique allows you to manipulate fullness by folding your fabric, and then sewing one row parallel to it. The stitching ends and fullness is released. While tucks and pleats look similar, tucks can be as small as an inch in width. Many times, tucks can be made in one area. They can be turned onto the garment’s outside as ornamentation. (in Fashion Dictionary)

What else does tuck mean?

A tap or beat, particularly on a drum. (in Merlin Dictionary)

Secure or confine by folding or pushing the edge. (in Merlin Dictionary)

Wrap or cover tightly, such as by tucking in a blanket. (in Merlin Dictionary)

For a snug, out-of-the way place (in Merlin Dictionary)

Save your items in a secure place. (in Merlin Dictionary)

To do tucks. (in Merlin Dictionary)

Flattened pleats or folds, particularly a narrower one that is stitched in. (in Merlin Dictionary)