sag
noun
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a shape that sagsβThere was a sag resting in the chair to my left.βdroop
verb
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to droop, sink, or settle from or as if from pressure or loss of tautnessβI saw the kid's pants sagging and I became wary of the fact that they might drop to the floor at any second now.βflag
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to cause to sagβI sagged the fabric over the chair.βsag down