お気遣いなく。 — Please don't go to any trouble on my account. (Cultural · Communication, Polite to Host, JLPT N4)

Gesture & etiquette

A gentle wave of one hand (palm outward) paired with a warm smile and slight bow conveys this naturally; avoid shaking your head vigorously, which can seem abrupt.

Used to gracefully decline excessive host attentiveness — for example, when a host keeps refilling tea or fussing over you. It is polite yet warm, signaling that you are comfortable and they need not exert themselves further. Without this phrase, foreigners may silently allow hosts to over-serve out of not wanting to seem ungrateful.