A sentence or series of words that is hard to say correctly is called a tongue twister in English. Children love tongue twisters and challenge their friends to try to say them fast several times in row. For English learners, tongue twisters are a fun way to work on one or two sounds at a time to get the pronunciation just right. Start by saying the tongue twister slowly, then try to speed up. Once you can say a tongue twister through, try to say it twice or three times in a row for a bigger challenge.