"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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