droop

(noun) a shape that sags. Synonyms: sag. Example: "There was a sag in the chair seat."

(verb) droop, sink, or settle from or as if from pressure or loss of tautness. Synonyms: sag, swag, flag.

(verb) hang loosely or laxly. Synonyms: loll. Example: "His tongue lolled."

(verb) become limp. Synonyms: wilt. Example: "The flowers wilted."