Grade 3 knock Get Printable Handwriting (knock) 1 syllables Learn It! Spelling Test Definition verb. 1 rap with the knuckles; 2 deliver a sharp blow or push; 3 find fault with;noun. the sound of someone rapping with their knuckles Example Sentence Knock gently on the door. Synonyms rap; strike; hit Antonyms tickle Share with your friends: