碍事 àishì to be in the way
to be in the way; to be a hindrance; (usually in the negative) to be of consequence; to matter
How to remember 碍事: 碍 to block + 事 matter = to be in the way.
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How it is used
- To be in the way / a hindrance - 这箱子放门口太碍事了 (zhè xiāngzi fàng ménkǒu tài àishì le) this box is really in the way by the door.
- Also 'to matter', usually negated: 不碍事 (bú àishì) 'it's no big deal / never mind'. A colloquial way to wave off a small injury or trouble.