Combining them literally gives you: “Opportunity (机) should not (不可) be lost (失).” The meaning is direct and clear—a perfect fusion of its parts.
This idiom is a cornerstone of Chinese strategic thinking, emphasizing that timing is as important as preparation. It's famously paired with another phrase to form a couplet: 机不可失,时不再来 (jī bù kě shī, shí bù zài lái), which means “An opportunity cannot be lost, for time will not come again.” This highlights a deep-seated cultural belief in pragmatism and the importance of decisive action.
This concept is woven into classic Chinese literature and historical accounts, such as *Romance of the Three Kingdoms*, where generals win or lose battles based on their ability to recognize and act upon a fleeting opportunity.
机不可失 is a formal idiom, but it's widely understood and frequently used in situations where the stakes are high and time is short.
It is generally used in a positive or neutral tone to encourage action, but it can also be used with a sense of regret when looking back on a missed chance.