1. Long life: This is the most common meaning. It's a noun meaning "long life" or "longevity," similar to "life expectancy" in English. It's often used in phrases like "jangsu-haeyo" (장수하세요) which means "Live long!" or "May you live a long life!".
2. General: This meaning is less common. It can be used as a noun referring to "generals" or "military leaders."
Therefore, the meaning of "jangsu" depends on the context. You can tell which meaning is intended by looking at the surrounding words and phrases.
For example, if you see "jangsu" followed by "haeyo," it's likely referring to "long life." If you see "jangsu" mentioned alongside terms like "army" or "war," it's probably referring to "generals."