| backup | (noun) the act of providing approval and support | Synonyms: backing, championship, patronage |
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| (noun) (computer science) a copy of a file or directory on a separate storage device | Synonyms: computer backup |
| (noun) a musical part (vocal or instrumental) that supports or provides background for other musical parts | Synonyms: accompaniment, musical accompaniment, support |
| (noun) someone who takes the place of another (as when things get dangerous or difficult) | Synonyms: backup man, fill-in, relief, reliever, stand-in, substitute |
| (noun) an accumulation caused by clogging or a stoppage | - |
| checkup | (noun) a thorough physical examination; includes a variety of tests depending on the age and sex and health of the person | Synonyms: health check, medical, medical checkup, medical exam, medical examination |
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| cockup | (noun) something badly botched or muddled | Synonyms: balls-up, ballup, mess-up |
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| fuckup | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, pratfall |
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| (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, botcher, bumbler, bungler, butcher, fumbler, sad sack, stumbler |
| lockup | (noun) the act of locking something up to protect it | Synonyms: locking |
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| (noun) jail in a local police station | - |
| pickup | (noun) the act or process of picking up or collecting from various places | - |
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| (noun) the act of taking aboard passengers or freight | - |
| (noun) a light truck with an open body and low sides and a tailboard | Synonyms: pickup truck |
| (noun) an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable | Synonyms: cartridge |
| (noun) mechanical device consisting of a light balanced arm that carries the cartridge | Synonyms: pickup arm, tone arm |
| (noun) anything with restorative powers | Synonyms: pick-me-up |
| (noun) the attribute of being capable of rapid acceleration | Synonyms: getaway |
| (noun) a warrant to take someone into custody | - |
| (noun) a casual acquaintance; often made in hope of sexual relationships | - |
| stickup | (noun) robbery at gunpoint | Synonyms: armed robbery, heist, holdup |
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| wickup | (noun) tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plant | Synonyms: Epilobium angustifolium, fireweed, giant willowherb, rosebay willowherb |
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