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foul vs back up

back up vs foul

foul is a noun but back up is not a noun.

foul is an adjective but back up is not an adjective.

foul and back up both are verbs.

Word NounAdjectiveVerbAdverb
foul Yes Yes Yes No
back up No No Yes No
As verbs, foul and back up are synonyms defined as:
  • foul and back up: become or cause to become obstructed
Other synonyms of foul include choke, choke off, clog, clog up, congest, crap up.
foul (noun) back up (noun)
an act that violates the rules of a sport
foul (adjective) back up (adjective)
(of a baseball) not hit between the foul lines
disgustingly dirty; filled or smeared with offensive matter
characterized by obscenity
(of a manuscript) defaced with changes
offensively malodorous
highly offensive; arousing aversion or disgust
especially of a ship's lines etc
violating accepted standards or rules
foul (verb) back up (verb)
become soiled and dirty establish as valid or genuine
make unclean become or cause to become obstructed
spot, stain, or pollute make a copy of (a computer file) especially for storage in another place as a security copy
make impure move backwards from a certain position
commit a foul; break the rules give moral or psychological support, aid, or courage to
hit a foul ball
become or cause to become obstructed
Difference between foul and back up

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