Webster's Revised Unabridged Dictionary · 1913

welt

welt (welt) , noun

[Old English welte, probably from Welsh gwald a hem, a welt, gwaldu to welt or to hem.]

1.
That which, being sewed or otherwise fastened to an edge or border, serves to guard, strengthen, or adorn it
(a)
A small cord covered with cloth and sewed on a seam or border to strengthen it; an edge of cloth folded on itself, usually over a cord, and sewed down.
(b)
A hem, border, or fringe.
(c)
In shoemaking, a narrow strip of leather around a shoe, between the upper leather and sole.
(d)
In steam boilers and sheet-iron work, a strip riveted upon the edges of plates that form a butt joint.
(e)
In carpentry, a strip of wood fastened over a flush seam or joint, or an angle, to strengthen it.
(f)
In machine-made stockings, a strip, or flap, of which the heel is formed. [Obsolete]
2.
(Heraldry) A narrow border, as of an ordinary, but not extending around the ends.
3.
A raised ridge on the surface of the skin, produced by a blow, as from a stick or whip; a wale; a weal; as, to raise welts on the back with a whip.
4.
A blow that produces a welt{3}.
Collocations (1)
Welt joint , a joint, as of plates, made with a welt, instead of by overlapping the edges. See Weld, n., 1 (d).

Welt , transitive verb

To furnish with a welt; to sew or fasten a welt on; as, to welt a boot or a shoe; to welt a sleeve.

Welt , transitive verb

To wilt. [Rare]