English version

a hard taskmaster/master

From Longman Dictionary of Contemporary Englisha hard taskmaster/mastera hard taskmaster/mastersomeone who makes people work too hard hard
Examples from the Corpus
a hard taskmaster/masterThe summer is a hard master.True to his word, he schooled her in horsemanship and was a hard taskmaster.He was a hard master and a dangerous enemy.She was a hard taskmaster but a considerably fairer one than la Belle Ethel.
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