noun. an accumulation caused by clogging or a stoppage a traffic backup on the main street|he discovered a backup in the toilet |
noun. 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 |
noun. a musical part (vocal or instrumental) that supports or provides background for other musical parts |
noun. (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 |
noun. the act of providing approval and support his vigorous backing of the conservatives got him in trouble with progressives |
