noun
a type of chair with arms and a back, typically used for relaxation or comfort
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The armchair quarterback criticized the team's play-calling decisions from the comfort of his living room.
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Don't be such an armchair quarterback, get out there and show us how it's done!
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Stop being a couch potato and acting like an armchair quarterback.
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He's always quick to offer his opinion, but he's just an armchair quarterback when it comes to actually doing the work.