I .
/ sæg; NAmE / verb ( -gg- ) [ v ]
1.
to hang or bend down in the middle, especially because of weight or pressure :
a sagging roof
The tent began to sag under the weight of the rain.
Your skin starts to sag as you get older.
2.
to become weaker or fewer :
Their share of the vote sagged badly at the last election.
► sag noun [ U , C , usually sing. ]:
Weight has caused the sag.
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IDIOMS
see jaw noun
II .
/ sɑːg; NAmE / noun
= saag
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WORD ORIGIN
late Middle English (as a verb): apparently related to Middle Low German sacken , Dutch zakken subside.