The word 抓紧 is formed by combining two separate actions into a single, more potent concept. The first character, 抓 (zhuā), means to grab or seize with the hand. The second, 紧 (jǐn), means tight or tense. When placed together, they create a sequential and causal image: the act of grabbing is immediately followed by, and inherently causes, the state of holding tightly, resulting in the unified meaning of "to firmly grasp" or "to seize tightly", conveying both the initial action and its decisive, secure conclusion.