We found 4 dictionaries that define the word the school of hard knocks:

General (3 matching dictionaries)

1. the school of hard knocks: Oxford Learner's Dictionaries

Miscellaneous (1 matching dictionary)

2. the school of hard knocks: Idioms

Phrases: class time at the school of hard knocks, more... ▸ Words similar to the school of hard knocks ▸ Usage examples for the school of hard knocks ▸ Idioms related to the school of hard knocks ▸ Wikipedia articles (New!) ▸ Words that often appear near the school of hard knocks ▸ Rhymes of the school of hard knocks ▸ Invented words related to the school of hard knocks