back up	make copy of information on your computer
back up	hive support to someone by telling other you agree with them backup
change around	move things so that they are in different places or positions
change into	change state or form \ change clothes or piece of clothing you are wearing
do away with	get rid of
do up	repair, paint or improve sth big ( building, boat, car )
do up	fasten an item of clothing
fade away	dissapear slowly
key in	put information into computer or other divices using keys or keyboard
make into	change sth ot someone so that they become something else
mix up	put things together without any order
mix up	think that one person or thing is another person or thing
switch on	start sth ( machine, light )
take apart	separate an object into pieces
test out	try using sth such as a machine or product to find out whether it works correctly or is satisfactory
turn into	change sth/sb or develop them into sth different
use up	use all of a supply of something
wear out	use sth a lot so that it no longer works, or can no longer be used
change out of	take off the clothes or a piece of clothing you are wearing and put on different ones