回答 (huídá) - to answer or reply. Built from 回 (huí – return) + 答 (dá – answer), so literally "return an answer." What's a question you find hard to 回答?
咖啡 (kāfēi) - coffee ☕ A loanword, chosen for its sound rather than meaning (both characters have the 口 "mouth" radical, often used for phonetic borrowings). 你每天喝几杯咖啡? (How many cups of coffee do you drink every day?)
biết = to know. Covers knowing facts, people, and knowing how to do something - tôi biết bơi (I know how to swim), bạn có biết không? (do you know?). What's something you mới biết (just learned) about Vietnamese?
画蛇添足 (huà shé tiān zú) - literally "draw a snake, add feet" 🐍 From an old story where a man lost a drawing contest by adding legs to his already-finished snake