verb

• (transitive) To put (something such as a knife or sword) into a sheath.
  "Sheath your Dagger: / Be angry when you will, it ſhall haue ſcope: […]"
• (transitive) To encase (something) with a protective covering.
  "A chearful heart does good like a medicine, but envy corrodes like a poiſon; it is ſo ſharp, that it cuts the body which ſheathes it."
• (transitive) Of an animal: to draw back or retract (a body part) into the body, such as claws into a paw.
  "So when the gen'rous Lyon has in ſight / His equal match, he rouſes for the fight; / But when his foe lyes proſtrate on the plain, / He ſheaths his paws, uncurls his angry mane; / And, plea'd with bloudleſs honours of the day, / Walks over, and diſdains th' inglorious Prey, […]"
• (transitive, dated or literary, poetic, figuratively) To thrust (a sharp object like a sword, a claw, or a tusk) into something.
  "And nuzzling in his flank, the loving swine / Sheathed unaware the tusk in his soft groin."