We found 4 dictionaries that define the word knock-knock:

General (3 matching dictionaries)

1. Knock-knock, knock-knock: Wordnik
2. knock-knock: Wiktionary
3. Knock-knock: Wikipedia, the Free Encyclopedia

Slang (1 matching dictionary)

4. knock-knock: Urban Dictionary

▸ Words similar to knock-knock ▸ Usage examples for knock-knock ▸ Idioms related to knock-knock ▸ Wikipedia articles (New!) ▸ Words that often appear near knock-knock ▸ Rhymes of knock-knock ▸ Invented words related to knock-knock