To wear one's trousers so that their top is well below the waist.
To pull down someone else's pants.
Origin
From late Middle English saggen, probably of Scandinavian/Old Norse origin (compare Norwegian Nynorsk sagga ("move slowly")); probably akin to Danish and Norwegian sakke, Swedish sacka, Icelandic sakka, Old Norse sokkva. Compare also Dutch zakken and German sacken (from Low German).
Modern English dictionary
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