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prop (n.1)

"a support, a rigid thing used to sustain an incumbent weight" (usually applied to something not forming a part of the object supported), mid-15c., proppe, probably from Middle Dutch proppe "vine prop, support; stop for a bottle," a word of unknown origin. Probably related to Old High German pfropfo, German pfropfen "to prop," which are perhaps from Latin propago "a set, layer of a plant" (see propagation). Irish propa, Gaelic prop are said to be borrowed from English.

prop (n.2)

"object used in a play," 1898, from props (1841), shortened form of properties (which was in theatrical use from early 15c.); see property.

prop (v.)

"to support or prevent from falling by placing something under or against," mid-15c., probably from prop (n.1) or a related verb in Dutch. Meaning "support or sustain" in a general sense (especially a cause, institution, etc. at risk of failing) is from 1540s. Related: Propped; propping.

prop (n.3)

short for propeller, 1914.

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Definitions of prop from WordNet
1
prop (n.)
a support placed beneath or against something to keep it from shaking or falling;
prop (n.)
any movable articles or objects used on the set of a play or movie;
before every scene he ran down his checklist of props
Synonyms: property
prop (n.)
a propeller that rotates to push against air;
Synonyms: airplane propeller / airscrew
2
prop (v.)
support by placing against something solid or rigid;
Synonyms: prop up / shore up / shore
From wordnet.princeton.edu