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To sink, settle, or droop downward. The skin around my neck has started sagging down. Just another wonderful perk of getting old, I suppose. His shoulders sagged down as he realized he wouldn't be getting the promotion after all.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
to droop downward. The branch sagged down and nearly touched the ground. When the rain got the drapes wet, they sagged down and touched the floor.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.