|1.||[ verb ] move backwards from a certain position|
"The bully had to back down"
|Related terms:||withdraw withdrawal|
|2.||[ verb ] give moral or psychological support, aid, or courage to|
"She supported him during the illness" "Her children always backed her up"
|Related terms:||help promote sponsor second patronize carry undergird support backing|
|3.||[ verb ] establish as valid or genuine|
"Can you substantiate your claims?"
|Related terms:||confirm reinforce vouch|
|4.||[ verb ] (computer science) make a copy of (a computer file) esp. for storage in another place as a security cop|
"You'd better back up these files!"
|Related terms:||copy computer|
|5.||[ verb ] become or cause to become obstructed|
|Synonyms:||clog choke_off congest choke foul clog_up|
"The leaves clog our drains in the Fall" "The water pipe is backed up"
|Related terms:||unclog obstruct stuff silt_up gum_up crap_up congestion|