口音
koǔ yin · HSK 7
accent
👄 口音 = mouth (口 kǒu) + sound (音 yīn) = the sound your mouth makes = accent
口 kǒu is mouth, the same 口 as in 口语 (spoken language); 音 yīn is sound or tone, as in 音乐 (music). Together: the sound-print of a mouth, i.e. someone's accent or voice.
口 — pictograph of an open mouth
口 is one of the oldest pictographs in Chinese, originally drawn as a simple outline of an open mouth. Its core meaning 'mouth' extended naturally to 'opening' or 'entrance', as in 入口 (entrance). It also serves as a common radical in characters related to speech, eating, or apertures.