We found 9 dictionaries that define the word old days:

General (5 matching dictionaries)

1. the old days: Oxford Learner's Dictionaries
2. old days, the old days: Collins English Dictionary
3. old days: Wiktionary
4. Old Days: Wikipedia, the Free Encyclopedia
5. Old Days: TheFreeDictionary.com

Business (1 matching dictionary)

6. Old Days: Legal dictionary

Computing (1 matching dictionary)

7. Old Days: Encyclopedia

Miscellaneous (1 matching dictionary)

8. Old Days: Idioms

Slang (1 matching dictionary)

9. the old days: Urban Dictionary

Definitions from Wiktionary (old days) ▸ noun:  A period that was a relatively long time ago; the distant past. Similar: antiquity, Dark Ages, ancientry, antiquitie, prehistory, ancient, antique, ancient history, day and age, ancienty, more... Opposite: modern times, present day, contemporary era Phrases: good old days, the good old days, bad old days, in the old days, the old days, more... ▸ Words similar to old days ▸ Usage examples for old days ▸ Idioms related to old days ▸ Wikipedia articles (New!) ▸ Words that often appear near old days ▸ Rhymes of old days ▸ Invented words related to old days