Akademik

hard knocks
noun
a state of misfortune or affliction
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debt-ridden farmers struggling with adversity

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a life of hardship

Syn: ↑adversity, ↑hardship
Derivationally related forms: ↑adverse (for: ↑adversity)
Hypernyms: ↑misfortune, ↑bad luck, ↑tough luck, ↑ill luck
Hyponyms:
ill-being, ↑catastrophe, ↑disaster, ↑extremity, ↑distress, ↑affliction, ↑victimization, ↑nadir, ↑low-water mark

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Informal.
adversity or hardships.

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hard knocks — see knock, 2
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Main Entry:hard
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hard knocks
: difficult or painful experiences that people have in their lives or careers

He has taken plenty of hard knocks in his life.

The school of hard knocks [=the difficult experiences in his life] taught him how to be tough.

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Main Entry:knock

Useful english dictionary. 2012.