different between sagging vs gagging

English

sagging (countable and uncountable, plural saggings)

The act of something that sags.
- 1969, Sugar Technologists' Association of India, Proceedings
  It was noticed that there had been saggings and bulgings in the trays.
A manner of wearing pants or shorts below the waist, revealing some or all of the underwear.

sagging (comparative more sagging, superlative most sagging)

(of a person or clothes) Worn low on the waist, or wearing pants or shorts low on the waist.

sagging

From gag +? -ing.

gagging

gagging (plural gaggings)

A gag motion or reflex.
- 1973, Oliver Sacks, Awakenings
  She was restarted on L-DOPA later, in the middle of July, and this time the tongue-pulsions and gaggings were not evoked at all, but, on the contrary, a striking improvement occurred.

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