fattened Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to make fat; to become plump or fat Example Sentence The bear fattened on berries before the long winter. Synonyms plump; fatty; to make fat Antonyms slim Hear It! Say It! Write It! fattened Switch to cursive Start Rhymes Two Syllable Rhymes (2) fattened flattened Share with your friends: