A u-bend is the curved pipe under a sink that traps smells. Unscrew the u-bend.
The water sitting in the curve is the seal, and it stops drain air coming back up. A u-bend in an unused sink dries out, which is why an empty house smells.
1nounu-bendThe curved pipe under a sink that traps smells.
“The ring was in the u-bend, as rings usually are.”
u-bend is a pipe.
Practised in Tools & DIY