Catch one's breath is a phrase that refers to the act of taking a moment to pause and take a deep breath. The two crossword solutions for this phrase are GASP and REST, both of which have four letters. GASP is an expression of surprise or shock, often accompanied by a sudden intake of breath. REST, on the other hand, is a state of inactivity or repose, usually associated with relaxation. Together, these two words capture the idea of catching one's breath, which is a brief pause to take a deep breath and relax.