1. (verb) support, back up
give moral or psychological support, aid, or courage to
Synonyms: digest, abide, congest, tolerate, choke, foul, support, plunk for, hold up, endure, choke off, back, stick out, back down, clog, fend for, patronise, clog up, back up, keep going, put up, corroborate, endorse, stomach, defend, confirm, bear out, back off, affirm, subscribe, brook, indorse, suffer, stand, sustain, patronize, underpin, substantiate, hold, plump for, patronage, bear
2. (verb) back up, back off, back down
move backwards from a certain position
Synonyms: back, choke off, foul, clog, back off, chicken out, back up, bow out, support, back down, clog up, congest, pull out, choke
3. (verb) back, back up
establish as valid or genuine
Synonyms: second, bet on, gage, foul, clog up, plump for, support, congest, back off, plunk for, game, choke off, back, indorse, stake, choke, clog, punt, endorse, back up, back down
4. (verb) back up
make a copy of (a computer file) especially for storage in another place as a security copy
Synonyms: back, choke off, foul, clog, back off, back up, support, back down, clog up, congest, choke
5. (verb) clog, choke off, clog up, back up, congest, choke, foul
become or cause to become obstructed
Synonyms: contaminate, drop dead, strangle, pop off, gag, buy the farm, give-up the ghost, clot, choke, foul, throttle, support, cash in one's chips, fret, befoul, kick the bucket, expire, choke off, back, pass away, perish, croak, clog, conk, asphyxiate, defile, clog up, back up, snuff it, decease, maculate, back down, go, choke down, constipate, pass, exit, back off, die, pollute, suffocate, overload, congest, scrag, stifle, choke back
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Synonyms for back up 
