| foul | (verb) become soiled and dirty | - |
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| (verb) make unclean | - |
| (verb) spot, stain, or pollute | Synonyms: befoul, defile, maculate |
| (verb) make impure | Synonyms: contaminate, pollute |
| (verb) commit a foul; break the rules | - |
| (verb) hit a foul ball | - |
| (verb) become or cause to become obstructed | Synonyms: back up, choke, choke off, clog, clog up, congest, crap up |
| found | (verb) use as a basis for; found on | Synonyms: base, establish, ground |
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| (verb) set up or lay the groundwork for | Synonyms: constitute, establish, institute, plant |
| (verb) set up or found | Synonyms: establish, launch, set up |
| founder | (verb) break down, literally or metaphorically | Synonyms: break, cave in, collapse, fall in, give, give way |
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| (verb) sink below the surface | - |
| (verb) stumble and nearly fall | - |
| (verb) fail utterly; collapse | Synonyms: fall flat, fall through, flop |