Cătch'-word, n.

(-wŏrd), n. 1. Among theatrical performers, the last word of the preceding speaker, which reminds one that he is to speak next; cue.

2. (Print.) The first word of every page of a book after the first, inserted at the right-hand bottom corner of the preceding page for the assistance of the reader. It is seldom used in modern printing.
3. A word or phrase caught up and repeated for effect; as, the catch-word of a political party, &c.