Etymology
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pounce (v.)

1680s, originally "to seize with the pounces," from Middle English pownse (n.) "hawk's claw" (see pounce (n.1)). The earlier verb sense was "perforate, make holes in" (late 14c.). Meaning "to jump or fall upon suddenly" is from 1812. Figurative sense of "lay hold of eagerly" is from 1840. Related: Pounced; pouncing. A doublet of punch (v.).

pounce (n.1)

"claw of a bird of prey," late 15c., pownse, probably from Old French ponchon "lance, javelin; spine, quill" (Modern French poinçon; see punch (v.)). So called for being the "claws that punch" holes in things. In falconry, the heel claw is a talon, and others are pounces. Hence, "a stab, thrust" (c. 1400). In Middle English also the name of a tool for punching holes or embossing metal (late 14c.), from pounce (v.) in the special sense of "ornament by perforation." Clothing ornamented with cut-out figures was pounced.

pounce (n.2)

"an act of jumping or falling upon," 1825, from pounce (v.).

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Definitions of pounce
1
pounce (v.)
move down on as if in an attack;
Synonyms: swoop
2
pounce (n.)
the act of pouncing;
From wordnet.princeton.edu