Back up
Back up verb - Become or cause to become obstructed.
Usage example: The water pipe is backed up
Foul
Foul verb - Become or cause to become obstructed.
Both terms in one sentence
-
Funny enough, a foul ball is actually hit into their original seats while Rocko and Heffer are making their climb back up to the top of the lighting rig, before falling back down toward the field of play...
Source: The Worst Seat in the House
Cite this Source
Foul and Back up. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/back_up/foul
Back up & Foul. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/back_up/foul>.
Foul or Back up. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/back_up/foul.
Google Ngram Viewer shows how "back up" and "foul" have occurred on timeline