What it is: Fixed expressions with meanings different from the literal words. What it’s for: Understand movies, jokes, and natural speech. Example: “It’s raining cats and dogs.” = raining very heavily.

• Learn only high-frequency idioms.
• Always learn with context + one example sentence.
• Don’t force idioms in formal writing.

• break the ice: start a friendly conversation
• piece of cake: very easy
• once in a blue moon: very rarely

• *idiom* /ˈɪdiəm/: thành ngữ
• *literal* /ˈlɪtərəl/: nghĩa đen
• *context* /ˈkɒntekst/: ngữ cảnh
• *frequency* /ˈfriːkwənsi/: tần suất