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Meaning of weight belt

weight' belt"

Pronunciation: [key]
— Scuba Diving.
  1. a belt worn to control a diver's buoyancy under water, on which slotted lead weights can be slipped according to the diver's body size and weight and having a quick-release buckle for emergency discarding.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.