sheathing (Noun) — Protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior.
sheathing (Verb) — Cover with a protective sheathing. ex. "sheathe her face"
sheathing (Verb) — Enclose with a sheath. ex. "sheathe a sword"
sheathing (Verb) — Plunge or bury (a knife or sword) in flesh.