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Definition of keep up:

  1. To hold or keep in any particular state or condition; to support; to sustain; to uphold; to keep up; not to suffer to fail or decline; as, to maintain a certain degree of heat in a furnace; to maintain a fence or a railroad; to maintain the digestive process or powers of the stomach; to maintain the fertility of soil; to maintain present reputation.


prevail, wield, corroborate, pursue, hold, rise, learn, stick to, protract, survive, carry on, lay up, run on, get ahead, abed, perdure, do, acquaint yourself with something, husband, hold on, maintain, simulate, draw out, abide, exert, deduce, absorb, master, remain, play out, affirm, reach, safeguard, keep, keep abreast, know, tease, watch over, accompany, pick up, have a feel for something, succeed, rival, go on, travel along, break through, get up, last, persist, espouse, bear, economize, follow through, bear on, fall out, substantiate, prolong, sit up, come after, get, travel, fall/fit into place, bide, cherish, conform to, keep pace (with), observe, train, retire, arise, take after, economise, develop, work out, extend, be, confirm, acquire, sustain, suffer, nurture, come, get along, comprehend, get on with, leave behind, conserve, defend, retrain, advance, pretend, support, carry, stay the course, trace, preserve, nourish, lie in, uphold, adopt, save, keep an eye on, outpace, follow, equal, play along, survey, progress, compete, plod along, keep on, get on, postdate, fake, see the light, make sense of something, assert, understand, press ahead, asseverate, early bird, persevere, continue, comply, care for, endure, have, watch, stick with, abide by, prop, surveil, forge ahead, get the idea, hold up.