drainpipe
US /ˈdreɪn.paɪp/
UK /ˈdreɪn.paɪp/

1.
a pipe for carrying off rainwater from a roof
:
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The old drainpipe was clogged with leaves.
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We need to repair the leaking drainpipe.
2.
a very narrow trouser leg
:
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He wore tight jeans with a drainpipe cut.
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The fashion of drainpipe trousers was popular in the 1950s.