back-up

(v) give moral or psychological support, aid, or courage to
- She supported him during the illness
- Her children always backed her up
support,
(v) move backwards from a certain position
- The bully had to back down
back down, back off,
(v) establish as valid or genuine
- Can you back up your claims?
back,
(v) make a copy of (a computer file) especially for storage in another place as a security copy
- You'd better back up these files!
(v) become or cause to become obstructed
- The leaves clog our drains in the Fall
- The water pipe is backed up
clog, clog up, congest, choke off, foul, choke,

support back down back off back clog clog up congest choke off foul choke

unclog