We found 4 dictionaries that define the word a rap on the knuckles:

General (3 matching dictionaries)

1. a rap on the knuckles: Merriam-Webster
2. a rap on the knuckles: Oxford Learner's Dictionaries

Miscellaneous (1 matching dictionary)

3. a rap on the knuckles: Idioms

▸ Words similar to a rap on the knuckles ▸ Usage examples for a rap on the knuckles ▸ Idioms related to a rap on the knuckles ▸ Wikipedia articles (New!) ▸ Words that often appear near a rap on the knuckles ▸ Rhymes of a rap on the knuckles ▸ Invented words related to a rap on the knuckles