"sheathing" in the noun sense
1. sheathing, overlay, overlayer
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" in the verb sense
1. sheathe
cover with a protective sheathing
"sheathe her face"
2. sheathe
enclose with a sheath
"sheathe a sword"
3. sheathe
plunge or bury (a knife or sword) in flesh
Source: WordNet® (An amazing lexical database of English)
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