weir
nounUK /wɪə/
US /wɪr/
A small wall built across a river to hold back or control the water.
The old weir slowed the river so the fish could swim upstream.
SYNONYMS
OTHER MEANINGS
2. A fence or trap set in a river to catch fish.
They placed a weir across the stream to catch salmon.
3. A low dam that raises the water level for mills or boats.
The mill wheel turned because the weir kept the water deep.
4. A channel or opening that lets water flow over or around a barrier.
Water rushed through the weir after the heavy rain.