入浴
にゅうよく · nyuuyoku · JLPT N1 · noun
bathing
🛁 入 (enter) + 浴 (bath) = enter the bath = bathe
入 means enter and 浴 means bath or bathe, so 入浴 literally means entering the bath. 浴 also appears in 浴室 (bathroom) and 海水浴 (sea bathing).
入 — single pictograph, two slanting strokes
入 is a pictograph showing an arrowhead or pointed entrance, with two strokes converging downward to suggest something going inward. The original sense was 'to enter,' and it still carries that meaning today. It contrasts visually with 人 (person), where the strokes cross differently at the top.