| backup | | |
| n. (process) | 1. backup | an accumulation caused by clogging or a stoppage.; "a traffic backup on the main street"; "he discovered a backup in the toilet" |
| ~ accretion, accumulation | an increase by natural growth or addition. |
| n. (person) | 2. backup, backup man, fill-in, relief, reliever, stand-in, substitute | 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" |
| ~ compeer, equal, peer, match | a person who is of equal standing with another in a group. |
| ~ locum, locum tenens | someone (physician or clergyman) who substitutes temporarily for another member of the same profession. |
| ~ stunt man, stunt woman, double | a stand-in for movie stars to perform dangerous stunts.; "his first job in Hollywood was as a double for Clark Gable" |
| ~ alternate, surrogate, replacement | someone who takes the place of another person. |
| n. (communication) | 3. accompaniment, backup, musical accompaniment, support | a musical part (vocal or instrumental) that supports or provides background for other musical parts. |
| ~ part, voice | the melody carried by a particular voice or instrument in polyphonic music.; "he tried to sing the tenor part" |
| ~ descant, discant | a decorative musical accompaniment (often improvised) added above a basic melody. |
| ~ vamp | an improvised musical accompaniment. |
| n. (artifact) | 4. backup, computer backup | (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" |
| ~ duplication, duplicate | a copy that corresponds to an original exactly.; "he made a duplicate for the files" |
| ~ computer science, computing | the branch of engineering science that studies (with the aid of computers) computable processes and structures. |
| n. (act) | 5. backing, backup, championship, patronage | the act of providing approval and support.; "his vigorous backing of the conservatives got him in trouble with progressives" |
| ~ approval, approving, blessing | the formal act of approving.; "he gave the project his blessing"; "his decision merited the approval of any sensible person" |
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