retard

retard (Delay), verb check, countercheck, defer, ease off, hamper, hinder, hold up, impede, inhibit, procrastinate, stall, stem

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retard (Obstruct), verb arrest, bar, block, check, clog, condemn, constrict, control, cramp, curb, debar, diminish, disadvantage, discontinue, encumber, entrammel, hamper, hinder, hold up, impede, inhibit, intercept, interfere, interrupt, occlude, preclude, prevent, thwart, trammel, withstand

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retard (Slow up), verb brake, check, crawl, dawdle, decelerate, hamper, hinder, inhibit, interfere, linger, move slowly, slow down

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See also: ban, bar, block, check, clog, condemn, constrict, control, curb, debar, defer, delay, diminish, disadvantage, discontinue, encumber, enjoin, foil, hamper, hinder, hold up, impede, inhibit, interfere, interrupt, keep, obstruct, occlude, preclude, prevent, procrastinate, prolong, protract, restrain, stall, stem, thwart, trammel, withstand