I. verb
1.
Synonyms: slip 6, drop (off), fall (off or away), slide, slump
2.
Synonyms: droop 3, flag, swag, wilt
Related Word: bend, decline; dangle, flap, flop
Idioms: ||have a case of the sags
Antonyms: tauten
II. noun
1.
Synonyms: depression 2, basin, concavity, dip, hollow, sink, sinkage, sinkhole
Related Word: settling, sinking
2.
Synonyms: decline 3, dip, downslide, downswing, downtrend, downturn, drop, falloff, slip, slump