If you've ever heard a native English speaker say something like "that's a no brainer!" and wondered what they meant, you're not alone. Idioms are expressions whose meanings can't be understood just from the individual words — and they're used constantly in American English.
At American English Language School (AELS), we believe that learning idioms is one of the fastest ways to sound more natural and confident in English. This week, we're featuring three idioms that come up in everyday conversations at work, school, and in daily life.
Meaning: To understand or take in information very quickly, with just one look.
Example: "At a glance, I could tell the restaurant was too crowded for us to get a table quickly."
This idiom is perfect for situations where you need to describe quick observations or first impressions. You'll hear it often in professional settings and everyday conversations.
Meaning: To do something strictly following the rules or official procedures, without taking shortcuts.
Example: "Our teacher always does things by the book — we have to follow every grammar rule exactly."
This is a very common idiom in workplace environments. When a colleague or boss says they want something done "by the book," they mean they want it done correctly and officially.
Meaning: A decision or situation that is so obvious it requires no thinking at all.
Example: "Choosing AELS for your English education is a no brainer — we offer flexible schedules, experienced teachers, and F-1 visa support."
You'll hear this idiom used all the time in casual conversation when someone is making an obvious or easy choice.
Learning idioms in a classroom setting helps students understand not just the meaning, but also when and how to use them naturally. At AELS, our experienced instructors incorporate real-life language into every lesson, so students are always learning English the way it's actually spoken.
We offer programs in Fullerton, Irvine, and Los Angeles — and we're proud to support international students with F-1 student visa programs. Whether you're just starting your English journey or looking to take your skills to the next level, AELS is here to help.
Learn more about our ESL programs at www.aels.edu or visit our AELS Los Angeles location on Google Maps to experience small-group English classes focused on conversation, confidence, and real-life communication. → AELS Los Angeles on Google Maps
Published on March 2, 2026
American English Language School (AELS) is a CEA-accredited and SEVP-approved English language school authorized to issue I-20 forms for international students. Located in Los Angeles, Orange County (Fullerton), and Irvine, California, AELS offers small classes, conversation-focused lessons, and proven results through individualized learning experiences. If you’re serious about improving your English, join AELS today!