OD, affect, afflict, appall, be brought down, be felled, be struck down, be traumatized, break out, catch, catch cold, collapse, come down with, contract, debilitate, degenerate, derange, deteriorate, devitalize, disable, disgust, disimprove, disorder, enervate, enfeeble, erupt, fail, fall back, fever, get, get worse, give offense, go into shock, gross out, grow worse, horrify, hospitalize, incapacitate, indispose, invalid, lay up, let down, nauseate, offend, overdose, put off, put out, reduce, regress, relapse, reluct, repel, repulse, retrograde, retrogress, revolt, run a temperature, shock, slacken, slip back, take, take ill, turn, turn the stomach, unhinge, unsettle, upset, weaken, worsen