Idioms trong IELST speaking

• Once in the blue moon = From time to time = Occasionally = Thỉnh thoảng
• Over the moon = Like a dog with two tails = extremely happy
• Sth costs an arm and a leg = Very expensive
• Sth is a piece of cake = sth is very easy
• On the go: very busy
• Hustle and bustle: busy and excited activity: Hustle and bustle of the city
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