컸어요 (Keosseoyo): How to Say You’ve Grown in Korean

The Moment You Need Exactly One Word

You’re at a gathering. A Korean friend introduces their child — you last saw this kid as a toddler, maybe three years ago. Now they walk in taller, more composed. The distance between the child you remember and the person in front of you is almost physical.

Part of the Korean Grammar — Make Sense of It, Not Just Memorize series — start there if you’re new.

In English, you piece something together. “Oh wow, look how big you are!” or “You’ve gotten so tall!” It works. But it takes a few words to get there, and none of them feel quite right.

Korean lands the same feeling in one. Past tense. Warm without working at it. In my classes, the lightbulb goes on when learners realize 컸어요 keo-sseo-yo is literally “big-ed” — the past tense of being big. English splits “big” and “grow” into completely different vocabulary. Korean doesn’t bother.

One Korean Word, Two English Jobs

English uses separate words for size and growth. Describing a state: big, tall, large. Describing a change over time: grow, develop, mature. Two different lanes, two different words.

Korean uses one: 크다 keu-da. According to the National Institute of Korean Language, 크다 functions as both a descriptive adjective (“to be big”) and an action verb (“to grow, to develop”). This isn’t casual overlap or regional slang — it’s how the word works at its root.

Context and tense handle the rest. Flip to past tense, and the meaning shifts from static description to completed change. That shift is exactly what a moment like this needs.

Quick conjugation note: 크다 follows the ㅡ-drop pattern. The stem loses its ㅡ vowel before the past ending, so 크 + 었 collapses to 컸. Add 어요 for polite speech and you get 컸어요 keo-sseo-yo.

The past tense does something specific here. It doesn’t just mark time — it signals that a change happened, completed, and you’re registering it right now. At a reunion, a birthday, any “look how much has changed” moment, that’s the weight the word carries.

Four Forms, One Core

The same root shifts depending on what surrounds it. These four cover most situations you’ll actually encounter.

Register at a glance:

Try It

Two quick prompts — check your answers below.

Practice 1. You run into a Korean colleague at a café. They’re with their eight-year-old — you met this child briefly a few years ago as a toddler. React warmly in Korean.

Practice 2. The child’s parent smiles proudly. Complete the sentence: 정말 다 ___네요. (“She’s all grown up, really.”)

The Bridge Word

크다 keu-da is the bridge between being big and getting bigger. Korean collapses that into one root, and past tense does the emotional work — change happened, it’s complete, you noticed it. That’s the weight 컸어요 keo-sseo-yo carries at every reunion.

Once it’s in your vocabulary, you have the exact phrase Koreans reach for at every milestone moment. Warm. Natural. Nothing translated about it.

Korean has other words that work the same way — tense shifts the meaning, context does the rest. If 크다 clicked, the Korean Grammar Basics Hub is the place to keep going.

🔧 Practice what you just read: try the free Korean Verb Conjugator — 500 verbs, 12 forms each, with romanization.