transitive. To restore from a crumpled state.

transitive. To free (the brow, etc.) from wrinkles; to smooth (a wrinkled surface).

transitive. Probably: to cut open and expose or remove the backbone of (cf. ridge, n.1 1a).

transitive. To remove wrinkles from; to smooth.

transitive. To free from creases, wrinkles, or rumples; to make smooth or tidy; to unfold, open out.

transitive and intransitive. To stop puckering; to relax (the brow, lips, etc.) from being pursed or wrinkled.

transitive. To unfold.

transitive. To remove crinkles from.