noun
a vertical piece of wood or metal on the side of a door frame, against which the door is closed
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He leaned against the doorjamb, deep in thought.
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She stood in the doorway, her hand resting on the doorjamb.
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He propped himself up on the doorjamb, waiting for his friends.
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The truth hit her like a truck, knocking her back against the doorjamb of reality.