A dam, embankment. Obsolete.

A section of a river or canal kept artificially deep, so as to form a head of water for a mill, etc. Also: a lock. Now rare and historical.

A weir or dam across a river; a sluice or floodgate. ? Obsolete.

A device or construction designed to block the passage of water; = stop, n.2 8a. Now rare except in sense 1b.

A dam to hold back water, a weir or floodgate. Now dialect and technical.

A bank or dam used to contain or hold back water, as part of a drainage scheme. Cf. head, n.1 44a. Now historical and rare.

A lock or dam in a river.

a contrivance for temporarily arresting the flow of water in a pipe or watercourse (now spec. a lump of clay inserted for this purpose).

a dam or weir at the head of a mill-lead.

An article which serves for containing or retaining something. A stew, pond, or reservoir for fish; a weir or dam for retaining water. rare.

= stank, n.1 2.