02/07/2026
สิ (si) is a conversational particle that doesn't have a direct translation but it's a commonly used means of expressing attitude in colloquial Thai. It's normally used as a suffix attached to the end of a sentence to add emphasis, urgency, reassurance, or a sense of "of course!" to whatever you might be saying.
Depending entirely on your tone of voice and the situation, it can completely shift a sentence from a friendly nudge to a sharp command. You'll hear it used in a few key ways: First, it acts as a friendly invitation or encouragement, similar to saying "go ahead and..." or "...why don't you?" in English. For example, มาสิ (ma si) means "come on over!" and กินสิ (kin si) means "go ahead and eat!"
Second, it's used to state an obvious fact or agreement, functioning like "of course" or "obviously." If someone asks a question where the answer should be clear, replying ใช่สิ (chai si) means "of course, yes!" Finally, when spoken with a short, sharp tone, it adds a layer of urgency or impatience. It essentially turns a standard request into a firm command. Like when one says, "เร็วๆสิ" (rew-rew si) meaning "hurry up!" - in the photo: แพงกว่านี้แน่555 (dtaung paeng gwaa nee nae hahaha)
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