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According to WordNet, the noun "backup" has 5 sense(s).
107031752 a musical part (vocal or instrumental) that supports or provides background for other musical parts.
110648237 someone who takes the place of another (as when things get dangerous or difficult); "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins".
101213886 the act of providing approval and support; "his vigorous backing of the conservatives got him in trouble with progressives".
102771840 (computer science) a copy of a file or directory on a separate storage device; "he made a backup in case the original was accidentally damaged or erased".
- SUMO Mappings: Helping (subsuming mapping)
113437181 an accumulation caused by clogging or a stoppage; "a traffic backup on the main street"; "he discovered a backup in the toilet".
- SUMO Mappings: Object (subsuming mapping)
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