undressing is a form of:

Undress



verb
1.
(TRANSITIVE) ដោះ​សំពត់​ចេញ
ENGLISH MEANING
noun
1.
A loose, negligent dress; ordinary dress, as distinguished from full dress.
2.
An authorized habitual dress of officers and soldiers, but not full-dress uniform.
verb
1.
(TRANSITIVE) To divest of clothes; to strip.
2.
(TRANSITIVE) To divest of ornaments to disrobe.
3.
(TRANSITIVE) To take the dressing, or covering, from; as, to undress a wound.