Noun hard knocks has 1 sense
  1. adversity, hardship, hard knocks - a state of misfortune or affliction; "debt-ridden farmers struggling with adversity"; "a life of hardship"
    --1 is a kind of misfortune, bad luck, tough luck, ill luck
    --1 has particulars:
     ill-being; catastrophe, disaster; extremity; distress; affliction; victimization; nadir, low-water mark
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