To check is to pass action without betting when no bet is outstanding.
Explanation. Checking means you choose not to bet, but keep your cards in play, only when no one has bet before you in that betting round. It’s commonly used for pot control, disguised strength, or inducing bluffs. Saying “I checked it” tells that you didn’t put chips in but stayed in. Understanding when to check depends on position, board texture and opponents’ likely ranges.