Definition of prop verb from the Oxford Advanced American Dictionary

 

prop

 verb
verb
NAmE//prɑp//
 
Verb Forms present simple I / you / we / they prop
 
he / she / it props
 
past simple propped
 
-ing form propping
 
 
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to support an object by leaning it against something, or putting something under it etc.; to support a person in the same way prop something/somebody/yourself (up) (against something) He propped his bike against the wall. She propped herself up on one elbow. He lay propped against the pillows. prop something + adj. The door was propped open. Phrasal Verbsprop somethingup
See the Oxford Advanced Learner's Dictionary entry: prop