mix up

CIDE DICTIONARY

mix up, n. 

•  To confuse the identities of (two or more objects); to mistake (one object for another); as, at the family gathering he mixed up his two nieces, to their great amusement.  [PJC]
•  To mix together; -- usually implying a mistake, whether done intentionally or unintentionally; as, the mixed up this year's receipts with last year's, and it took hours to find the right ones.  [PJC]

THESAURUS

mix up

addle, addle the wits, admix, alloy, amalgamate, anarchy, ball up, becloud, bedazzle, befuddle, bemingle, bewilder, blend, bollix up, botch, botchery, bother, bug, chaos, cloud, coalesce, combine, commingle, commix, commixture, complicate, compose, composite, compound, concoct, confound, confuse, confusion, conglomerate, daze, dazzle, derange, disarrange, discombobulate, discomfit, discompose, disconcert, disjoint, disorganize, disorient, disrupt, distemper, distract, disturb, dizzy, embarrass, embrangle, emulsify, entangle, fabulous formless darkness, flummox, flurry, fluster, flutter, fog, foul up, foul-up, fuddle, fumble, fuse, fusion, fuss, garble, hash, hassle, homogenize, immingle, immix, immixture, implicate, integrate, interblend, interfusion, interlace, interlard, intermingle, intermix, intermixture, intertwine, interweave, involve, jumble, knead, knot, license, louse up, maze, merge, mess up, mingle, mingle-mangle, misdeem, misidentify, misrule, mist, mix, moider, morass, muck up, muddle, mull, muss, perplex, perturb, pi, play hob with, pother, put out, raise hell, ramify, rattle, ravel, riffle, ruffle, scramble, screw up, screw-up, shambles, shuffle, snafu, snarl, snarl up, stir up, syncretize, tangle, throw into confusion, throw together, toss together, tumble, unsettle, upset, work