"sagging" 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"
"sagging" in the adjective sense
1. drooping, droopy, sagging
hanging down (as from exhaustion or weakness)
Source: WordNet® (An amazing lexical database of English)
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