日焼け
ひやけ · hiyake · JLPT N1 · noun
tan
☀️ 日 (sun) + 焼け (burned) = 日焼け, sunburn: sun + burned, in that order
焼ける means to burn or bake, as in toast or skin. 日焼け is literally sun-burning, the same word order as English sunburn.
日 — pictograph of the sun
日 is a pictograph of the sun, originally drawn as a circle with a dot or stroke inside representing the sun's substance. Over time the round shape was squared off into the modern rectangular form. It means 'sun' and by extension 'day'.