Webster's English Dictionary

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prop

1. prop \'pra:p\ n [ME proppe, fr. MD, stopper; akin to MLG proppe stopper] 
   : something that props or sustains : SUPPORT 
2. prop vt or propped;  or prop.ping 1a: to support by placing something 
   under or against  1b: to support by placing against something  2: SUSTAIN, 
   STRENGTHEN 
3. prop n : PROPERTY 
4. prop n : PROPELLER