One of the mysteries of the English language finally explained.
1On a river, canal, etc.: = "lock" 11a. Now rare.
2Any of various devices or contrivances for locking water into or out of something, or in which water is used to seal something off.
3An airlock for use underwater.
Middle English; earliest use found in Close Rolls Henry III. From water + lock.
water lock/ˈwɔːtə lɒk/
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