Mastering idioms can significantly boost your IELTS score by enhancing your English language proficiency. Idioms are expressions whose meanings aren't obvious from the individual words. For example, phrases like "a blessing in disguise" or "beat around the bush" can make your language more colorful and native-like. Understanding and using the top 20 most common idioms in English can help you communicate more effectively, both in writing and speaking sections of the IELTS exam. They demonstrate your grasp of nuanced English, helping you to convey ideas more naturally and fluently.