Meaning of BACK UP

WordNet Dictionary
	Definition:		[v]  establish as valid or genuine; "Can you back up your claims?" [v]  become or cause to become obstructed; "The leaves clog our drains in the Fall"; "The water pipe is backed up" [v]  make a copy of (a computer file) esp. for storage in another place as a security cop; "You'd better back up these files!" [v]  move backwards from a certain position; "The bully had to back down" [v]  give moral or psychological support, aid, or courage to; "She supported him during the illness"
	Synonyms:		back, back down, back off, choke, choke off, clog, clog up, congest, foul, support
	Antonyms:		unclog
	See Also:		advance, affirm, aid, assist, back, block, boost, buy at, choke up, close up, confirm, copy, corroborate, crap up, draw back, encourage, endorse, frequent, further, gum up, help, impede, indorse, jam, lug, move back, obstruct, obturate, occlude, patronise, patronize, promote, pull away, pull back, recede, re-create, retire, retreat, second, shop, shop at, silt, silt up, sponsor, stuff, substantiate, support, sustain, undergird, withdraw
Thesaurus Terms
	Related Terms:		act for, advance, affirm, afford support, answer for, appear for, ascend, attest, authenticate, back, back away, back off, backpedal, backtrack, backtrail, backwater, bear, bear out, bear up, bolster, bolster up, brace, budge, buoy up, buttress, carry, certify, champion, change, change place, circle, circumstantiate, climb, come after, come last, commission, confirm, corroborate, countermarch, cradle, crutch, cushion, deputize, descend, document, ebb, elect, endorse, fall astern, fall back, fall behind, flow, follow, fortify, front for, get behind, get in behind, get over, give support, go, go around, go back, go backwards, go into reverse, go round, go sideways, gyrate, hold, hold up, keep afloat, keep up, lag behind, lend support, mainstay, maintain, make sternway, mount, move, move over, nominate, pillow, pinch-hit for, plunge, probate, progress, prop, prove, ratify, regress, reinforce, represent, retrogress, reverse, revert, rise, rotate, run, run interference for, second, shift, shore, shore up, shoulder, side with, sink, soar, speak for, spin, stand back of, stand behind, stand by, stand in for, stay, stick by, stick up for, stir, stream, strengthen, subside, subsidize, substantiate, substitute for, subvention, support, sustain, take sides with, trail, trail behind, travel, underbrace, undergird, underlie, underpin, underset, understudy, upbear, uphold, upkeep, validate, verify, vote, wane, warrant, whirl