ROGET THESAURUS
knock up
Fatigue
VB
be fatigued, yawn, droop, sink, flag, lose breath, lose wind, gasp, pant, puff, blow, drop, swoon, faint, succumb, fatigue, tire, weary, irk, flag, jade, harass, exhaust,
knock up, wear out, prostrate, tax, task, strain, overtask, overwork, overburden, overtax, overstrain.