mastered Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. 1 be or become completely proficient or skilled in; 2 get on top of; deal with successfully; 3 have dominance or the power to defeat over Example Sentence The swimmer mastered the backstroke. Synonyms excel in; aced; get the hang of; beat; defeat Antonyms be ignorant Hear It! Say It! Write It! mastered Switch to cursive Start Rhymes Two Syllable Rhymes (4) astred bastard mastered plastered Share with your friends: