sag verb

ADV. slightly | wearily | back, forward He sagged wearily back in his chair. Helga's body sagged forward.

PREP. against She sagged against the door. | under The shelf sagged under the weight of hundreds of volumes.

PHRASES sag in the middle a mattress that was beginning to sag in the middle

You can also check other dicts: sag (English, 中文解释 ), wordnet sense, Collins Definition

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