One of the mysteries of the English language finally explained.
work too hard, overwork, do too much, work like a horse, work like a slave, work like a Trojan, work day and night, burn the midnight oil, burn the candle at both ends, strain oneself, sweat, sweat blood, overtax oneself, overtax one's strength, overburden oneself, overload oneself, drive oneself too hard, push oneself too hard, run oneself into the ground, work oneself into the ground, wear oneself to a shadow, work one's fingers to the bone, wear oneself out, have too many irons in the fire, have too many balls in the air, burn oneself out, bite off more than one can chew
informal kill oneself, knock oneself out
vulgar slang sweat one's balls off, work one's balls off
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