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1. A receptacle at the entrance to a sewer designed to keep out large or obstructive matter.
2. A reservoir for collecting surface drainage or runoff.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Civil Engineering) US and Canadian a pit in a drainage system in which matter that might otherwise block a sewer is collected so that it may periodically be removed. Also called (in Britain and certain other countries): catch pit
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014