Adjective backed up has 1 sense
  1. backed, backed up - having backing; "a claim backed up by strong evidence"
    Antonym: unsupported (indirect, via supported)
,Verb back up has 5 senses
  1. support, back up - give moral or psychological support, aid, or courage to; "She supported him during the illness"; "Her children always backed her up"
    Derived form: noun backup5
    Sample sentence:
    Sam cannot back up Sue
  2. back up, back off, back down - move backwards from a certain position; "The bully had to back down"
    --2 is one way to withdraw, retreat, pull away, draw back, recede, pull back, retire, move back
    Sample sentences:
    Something ----s
    Somebody ----s
  3. back, back up - establish as valid or genuine; "Can you back up your claims?"
    --3 is one way to confirm, corroborate, sustain, substantiate, support, affirm
    Sample sentences:
    Somebody ----s something
    Something ----s something
  4. back up - make a copy of (a computer file) especially for storage in another place as a security cop; "You'd better back up these files!"
    --4 is one way to
    copy, re-create
    Derived form: noun backup4
    Sample sentence:
    Somebody ----s something
  5. clog, choke off, clog up, back up, congest, choke, foul - become or cause to become obstructed; "The leaves clog our drains in the Fall"; "The water pipe is backed up"
    --5 is one way to obstruct, obturate, impede, occlude, jam, block, close up
    Derived form: noun backup1
    Sample sentences:
    Something ----s
    Somebody ----s something
    Something ----s something
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