Cambridge Advanced Learner's Dictionary
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Definition
lock noun (WATER)
/lɒk/
/lɑːk/ n
/lɑːk/ n [C] a length of water with gates at each end where the level of water can be changed to allow boats to move between parts of a canal or river which are at different heights
(Definition of lock noun (WATER) from the Cambridge Advanced Learner's Dictionary)
