plug in - connect electrical equipment to the main supply of electricity, back up - prepare a second copy of a file, program, etc. that you can use if the main one fails , scan in - pass light  over a picture or document using a scanner in order to copy it and put it in the memory of a computer  , shut down - stop a machine working, turn down - reduce the noise produced by a piece of equipment by moving its controls, turn off - stop he flow of electricity by moving a switch, pressintg a button,, turn on - start the flow of electricity by moving a switch,, turn up - increase the sound of a piece of equipment, type in - use the keyboard to put information , break down - stop working because of a fault, log on - perform the actions that allow you to begin using a computer system, log off - perform the actions that allow you to finish using acomputer system  ,

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