give moral or psychological support, aid, or courage to;
"She supported him during the illness"; "Her children always backed her up" Synonym(s):support, back up
move backwards from a certain position; "The bully had to back down" Synonym(s):back up, back off, back down
establish as valid or genuine; "Can you back up your claims?" Synonym(s):back, back up
make a copy of (a computer file) especially for storage in another place as a security copy; "You'd better back up these files!"
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