"Catch cold" is a common phrase that refers to getting a cold or flu. However, there are various synonyms for this phrase that can help add more variety and nuance to your writing or speech. Some alternative phrases include "come down with a cold," "get a cold," "fall ill with a cold," "contract a cold," and "develop a cold." These phrases can help make your sentences more diverse and interesting while still conveying the same meaning. Remember, using synonyms is a great way to keep your writing fresh and engaging.