work like a horse

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work like a horse (third-person singular simple present works like a horse, present participle working like a horse, simple past and past participle worked like a horse)

1. (simile, idiomatic, informal) To work very hard; to toil.

• work like a dog
• work like a mule
• work like a nailer
• work like a Trojan

• workhorse
• piss like a racehorse, eat like a horse

• “work like a horse”, in OneLook Dictionary Search.
• work like a horse, work like a dog, work like a mule at Google Ngram Viewer