cài

The Vietnamese word cài is a versatile verb primarily meaning to fasten, attach, or pin. You will encounter it daily when describing the simple act of pinning a flower in hair or buttoning a shirt. However, its utility extends far beyond clothing and accessories, as it also serves as the standard term for latching a door or securing a closure. Understanding this core concept of physical attachment is the first step toward mastering its more complex applications. Beyond simple fastening, cài takes on a more strategic and sometimes secretive tone. It is the same word used when a spy is planted within an organization or when software is installed on a computer. We will also explore how it differs from the synonym gài and what it means to arrange things in a staggered, comb-like military formation. Watch the full lesson to see how this one word connects everyday chores with modern technology and tactical maneuvers.

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cài
Cô ấy cài một bông hoa nhỏ vào mái tóc.