a lock at the entrance to a tidal basin.
Worldly Ways To Say “Thank You”This small but mighty phrase, which dates from the 15th century, goes a long way in acknowledging kindnesses big and small.
Origin of tide lock
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for tide lock
At Eddyville the first lock, a tide-lock, bars the way, and here the horses and mules are kept.A Tale of the Tow-Path|Homer Greene