1. noun
a) Traditional Scottish garment, usually worn by men, having roughly the same morphology as a wrap-around skirt, with overlapping front aprons and pleated around the sides and back, and usually made of twill-woven worsted wool with a tartan pattern.
b) (historical) Any Scottish garment from which the above lies in a direct line of descent, such as the philibeg, or the great kilt or belted plaid;
2. verb
To gather up part of a long garment, and hold it with a tuck, belt, pin, etc., in order to make it shorter.
She kilted up her skirt and waded out to the boat.
Wikipedia foundation.