sag under

sag under (something)

1. To sink or droop beneath some physical weight or burden. I began sagging under the all the bags I had to carry from the car to the train station. She sagged a bit under the weight of her fallen comrade, but she gritted her teeth and pushed onward.
2. To lose vigor or resolve because of something; to flag or weaken in spirits as a result of something. The whole team sagged under the news that our project was being canceled. I found myself sagging under the realization that all that hard work had been for nothing.
See also: sag
Farlex Dictionary of Idioms.

sag under something

to droop under the burden of something. The porch roof sagged under the weight of the snow. The springs of the car sagged under the weight of all the passengers.
See also: sag
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • sag under (something)
  • sag down
  • loll out
  • sag
  • sag away
  • slant toward
  • slant toward (someone or something)
  • slump down in
  • slump down in (something)
  • slump down into (something)
References in periodicals archive
AFTRA leaders maintain they have negotiated the best deal possible, one they say improves on contracts obtained earlier this year by Hollywood directors and striking screenwriters, and they vow not to go back to the bargaining table with SAG under any circumstances.
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The natural sag test configuration occurred by removing the supporting board and allowing the flexible duct to sag under its own weight.
Static pressure losses in nonmetallic flexible duct