Definition of catch-word:
(n) :
(countable) The act of seizing or capturing.
(n) :
(countable) The act of catching an object in motion, especially a ball.
(n) :
(countable) The act of noticing, understanding or hearing.
(n) :
(uncountable) The game of catching a ball.
(n) :
(countable) Something which is captured or caught.
(n) :
(countable, colloquial, by extension) A find, in particular a boyfriend or girlfriend or prospective spouse.