B2 used to warn someone of danger or an accident that seems likely to happen当心,小心,留神
More examples
Watch out for thieves round here.
Watch out! It's rather wet over there.
Watch out for bears!
👨🏻🏫 Mr. Ng 劍橋詞典 📚 – cambridge.mister5️⃣.net切換為繁體中文