to make something into small pieces or a powder by pressing between hard surfaces碾碎,磨碎,把…磨成粉
to rub something against a hard surface, in order to make it sharper or smoother磨,把…磨锋利,把…磨光
to make a noise by rubbing your teeth together把牙齿咬得嘎嘎响;出声地磨牙
a difficult or boring activity that needs a lot of effort令人厌倦的苦事,苦差事
US disapproving a boring person who studies all the time and does nothing else只会读书的无趣之人,书呆子
👨🏻🏫 Mr. Ng 劍橋詞典 📚 – cambridge.mister5️⃣.net
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