Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A kind of movable dam, in one form consisting of two leavesresting against each other at the top when raised and folding downone over the other when lowered, for deepening shallow parts in ariver.
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
