1. back up - Noun
2. back up - Adjective
3. back up - Verb
establish as valid or genuine
move backwards from a certain position
become or cause to become obstructed
make a copy of (a computer file) especially for storage in another place as a security copy
give moral or psychological support, aid, or courage to
Source: WordNetback-up
Can you back up your claims? Source: Internet
The bully had to back down Source: Internet
The leaves clog our drains in the Fall Source: Internet
The water pipe is backed up Source: Internet
You'd better back up these files! Source: Internet
She supported him during the illness Source: Internet