To catch means to win a hand with a marginal holding.
Explanation. Saying you “caught” something refers to hitting exactly what you needed—like catching a pair with A‑9 on a 9‑2‑7 flop. It implies an element of luck rather than strong means. People say “I caught a lucky river” when they hit the needed card to take the pot. This term is common when describing hands won with mediocre holdings and unexpected turnarounds.