The Vietnamese word "đoản kiếm" is a noun that translates to "bayonet" in English. A bayonet is a blade that can be attached to the end of a rifle or similar firearm, allowing it to be used as a weapon for stabbing in close combat.
Basic Usage: "Lính sẽ gắn đoản kiếm vào súng để sẵn sàng chiến đấu."
(The soldiers will attach the bayonet to their guns to be ready for battle.)
Advanced Usage: "Trong lịch sử, đoản kiếm đã đóng vai trò quan trọng trong nhiều cuộc chiến tranh."
(Historically, bayonets have played an important role in many wars.)
"Đoản kiếm" is an important term in military vocabulary, referring specifically to a bayonet that enhances the combat capability of a soldier by allowing for close-quarters fighting.