lengthening Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to make or become longer Example Sentence The days begin lengthening as summer approaches. Synonyms make longer; extend; prolong; stretch Antonyms shorten Hear It! Say It! Write It! lengthening Switch to cursive Start Rhymes Three Syllable Rhymes (3) lengthening strengthening lengthening Share with your friends: