swells Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to increase in size or volume. Example Sentence The crowd swells as the concert begins. More Example Sentences The river swells after heavy rain. Synonyms grows; expands; increases Antonyms shrinks; decreases; diminishes Hear It! Say It! Write It! swells Switch to cursive Start Share with your friends: