U-bend
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a U-shaped piece of pipe, especially one under a toilet or sink, that holds water in its lower part and prevents unpleasant gases from getting out
U-bend meaning & definition 1 of U-bend.
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a line on a graph that starts high, gets much lower, and then rises again, giving it the shape of the letter U. It is also used to refer to situations in which something decreases and then increases again:
U-bend meaning & definition 2 of U-bend.
