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corner; nook; recess
「角」 has other readings with different meanings.
部屋の隅に本棚を置いた。
I placed a bookshelf in the corner of the room.
猫が隅に隠れている。
The cat is hiding in the corner.
教室の隅っこに座るのが好きだったな。
I used to like sitting in the corner of the classroom.