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We found 5 dictionaries with English definitions that include the word knock in:
Click on the first link on a line below to go directly to a page where "knock in" is defined.

General (4 matching dictionaries)

1. knock in: Merriam-Webster.com [home, info]
2. knock-in: Wordnik [home, info]
3. knock in: Wiktionary [home, info]
4. knock in: Dictionary/thesaurus [home, info]

Slang (1 matching dictionary)

5. Knock In: Urban Dictionary [home, info]

Quick definitions from Wiktionary (knock in) ▸ noun:  (card games, archaic) The game of lanterloo. ▸ verb:  (obsolete, Oxford University slang) To enter college after hours—after half-past ten at night when the doors have been locked. ▸ Words similar to knock in ▸ Usage examples for knock in ▸ Words that often appear near knock in ▸ Rhymes of knock in ▸ Invented words related to knock in