wâai
The wai — palms together, a small bow — is both greeting and thank-you. The rule foreigners miss: the younger or lower-status person wais first, and the senior person returns it, or just nods. So you wai your landlord, your partner's parents and monks (hands higher, thumbs to the eyebrows), but you do not wai the 7-Eleven cashier, the waiter or a child; a smile and ขอบคุณ is right. Staff wai customers as part of their job; returning it with a full wai is awkward, a nod is kind. Height matters: hands at the chest for peers, nose level for elders, forehead for monks and the King's image.
Return a wai from someone older with your hands at nose height.
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