1. to support, or prevent from falling, with or as if with a prop (often fol. by up). 2. to rest (a thing) against a support: He propped the ladder against the wall. 3. to support or sustain (often fol. by up). n. 4. a stick, rod, pole, beam, or other rigid support. 5. a person or thing serving as a support or stay. More @Wikipedia
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