"sags" in the noun sense

1. sag, droop

a shape that sags

"there was a sag in the chair seat"

"sags" in the verb sense

1. sag, droop, swag, flag

droop, sink, or settle from or as if from pressure or loss of tautness

2. sag, sag down

cause to sag

"The children sagged their bottoms down even more comfortably"

Source: WordNet® (An amazing lexical database of English)

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