verb
ADVERB
▪ a bit ( esp. BrE ), slightly
▪ visibly
▪
She seemed to visibly ~ at the thought of what lay ahead.
▪ limply
▪
All she could do was ~ limply in his arms.
▪ back , down , forward
▪
Martin sighed and sagged back in his chair.
▪
Helga's body sagged forward.
PREPOSITION
▪ against
▪
She sagged against the door.
▪ under
▪
The shelf sagged under the weight of hundreds of volumes.
PHRASES
▪ ~ in the middle
▪
a mattress that was beginning to ~ in the middle
Sag is used with these nouns as the subject: ↑ mouth , ↑ shoulder , ↑ skin