back ‧ up /ˈbækʌp/ BrE AmE noun
1 . [countable] something that you can use to replace something that does not work or is lost:
Always have a backup plan.
a backup generator
2 . [countable] a copy of a computer document, program etc, which is made in case the original becomes lost or damaged:
Make a backup of any work you do on the computer.
3 . [uncountable] people or things that can be used to provide support and help if they are needed:
Army units can only operate if they have sufficient backup.
a backup team
4 . [countable] American English someone who will play in a sports team if one of the other players is injured or ill SYN reserve :
a backup goalie
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THESAURUS
▪ help the things you do to make it easier or possible for someone to do something:
Now that I’m working, the kids need to give me more help with the housework.
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The book would never have been finished without his help.
▪ assistance help. Assistance is more formal than help , and is used especially about people giving official help:
The police are asking the public for their assistance.
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The project received financial assistance from the government.
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Thank you very much for your assistance, sir.
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He set up the business with the assistance of his two sons.
▪ aid help. Aid is more formal than help , and is used especially about money, food, medicine etc. that is given to countries or people that are in a very bad situation:
Aid is being sent to areas affected by the earthquake.
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The US spends billions of dollars on aid to developing countries.
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Another driver stopped and came to his aid.
▪ support help and encouragement:
Thanks to everyone who gave us their support.
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We could not have won the case without your support.
▪ cooperation help – used especially when people, organizations, or countries work together to get things done, and show that they are willing to do this:
a spirit of international cooperation
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The cooperation of landowners was needed for the plan to succeed.
▪ backup extra people, equipment etc that can be used in case people need help:
The officer waited for backup to arrive before making any arrests.