Cave in and Sag

Cave in verb - To fall down or in as a result of physical pressure.

Sag is a synonym for cave in in decline topic. In some cases you can use "Sag" instead the word "Cave in" as a verb or a noun, when it comes to topics like sink, give in, lowering, collapse.

Sag verb - To be limp from lack of water or vigor.

Cave in is a synonym for sag in decline topic. You can use "Cave in" instead the word "Sag" as a verb or a noun, if it concerns topics such as droop.