The Forceful Transitivizer -뜨리다/-트리다

Korean has a small family of transitive verbs that all end in -뜨리다 — 떨어뜨리다 "drop," 넘어뜨리다 "knock over," 무너뜨리다 "topple," 깨뜨리다 "shatter," 쓰러뜨리다 "knock down," 빠뜨리다 "drop into / leave out." They share a root with the everyday -어지다 intransitives (떨어지다 "fall," 넘어지다 "fall over," 깨지다 "break"), and the relationship is not accidental: -뜨리다 is the transitive twin that says "someone made it happen — suddenly, with force, or by mistake." This is where English speakers go wrong. They reach for -뜨리다 as if it were a neutral "cause to," a general-purpose causative you can bolt onto anything. It is not. It is a closed, semantically loaded suffix restricted to verbs of falling, breaking, and collapsing, and it always adds a jolt of force or accident.

What -뜨리다 does, and what its twin -트리다 is

-뜨리다 and -트리다 are two spellings of the same suffix. Both are Standard Korean, both are correct, and they are freely interchangeable — 떨어뜨리다 and 떨어트리다 are the same verb, and which one a speaker uses is largely personal habit and region. Do not treat one as a misspelling of the other; the National Institute of Korean Language lists both as standard.

The suffix attaches to a root that also feeds an -어지다 intransitive, giving you a matched pair:

The intransitive says the thing fell or broke by itself; the -뜨리다 form says you did it, and did it abruptly.

The first sentence has an agent acting on an object (컵을, marked with 을/를); the second has the cup simply undergoing the fall (컵이, marked with 이/가). That particle contrast — 을/를 for the -뜨리다 transitive, 이/가 for the -어지다 intransitive — is your fastest way to keep the pair straight. This is exactly the machinery behind Korean's broader habit of pairing a self-happening verb with an agent-driven one; see transitive/intransitive verb pairs for the wider system.

Force, suddenness, accident — the meaning -뜨리다 adds

Here is the point every textbook glosses over: -뜨리다 is not neutral causation. It encodes that the caused event was sudden, forceful, or unintended. Compare it with a plainer transitive of "breaking":

깨다 is the calm, deliberate "break/crack" — you crack an egg on purpose. 깨뜨리다 is "smash it to pieces," and it pulls in a strong flavour of oops. Because of that accident-and-impact meaning, -뜨리다 is the verb you reach for when something got dropped, knocked, or smashed unexpectedly.

The two roles of 빠뜨리다: "drop into" and "leave out"

빠뜨리다 deserves its own section because it carries the whole system's trickiest ambiguity. Its intransitive twin 빠지다 means both "fall into (water, a hole)" and "be omitted, be left out." So 빠뜨리다 inherits both: "drop into" and "leave out."

Both readings keep the force-and-accident nuance — a key slips out of your hand into the drain; a name slips off the list. Contrast the intransitive twin, where the thing does the slipping on its own:

The particle again tells the story: 이름이 빠졌어요 (이/가, it was omitted) versus 이름을 빠뜨렸어요 (을/를, I omitted it).

Newspaper and formal register: 무너뜨리다

The "collapse" pair 무너지다 / 무너뜨리다 lives comfortably in headlines and formal prose, where "bring down / topple" is a common metaphor for governments, records, myths, and market walls.

In plain-style written Korean (한다체), the same verbs appear as 무너뜨렸다, 떨어뜨렸다, 깨뜨렸다 — that is the form you will read in news articles and novels. The meaning is identical; only the sentence ending changes with register.

Why English speakers overreach with -뜨리다

English has no morpheme that means "cause, forcefully." It builds these meanings with separate verbs (drop, knock over, smash) or with light-verb frames (make it fall). So when a learner learns that -뜨리다 "makes a verb transitive," they generalise it into an all-purpose causative and try to stick it onto verbs that have nothing to do with falling or breaking — producing forms like ✗ 먹뜨리다 or ✗ 가뜨리다 that do not exist. The corrective is to remember that -뜨리다 is a closed set built on fall/break/collapse roots. For general "make someone do something," Korean uses the productive causative -게 하다 or a fused causative suffix — never -뜨리다.

Common Mistakes

1. Using -뜨리다 as a general "make" causative. It only attaches to fall/break/collapse roots. For "put the child to sleep," you need the causative 재우다, not any -뜨리다 form.

2. Putting an object on the intransitive twin. With an 을/를 object you need the -뜨리다 transitive, not -어지다.

3. "Leaving out" a name with the intransitive. To omit something (you as agent), use 빠뜨리다; 빠지다 is only "be omitted."

4. Using 깨뜨리다 for "break a record." Idiomatic "break a record" takes the neutral 깨다; 깨뜨리다 would mean literally shatter it.

5. Thinking -트리다 is a typo for -뜨리다. Both spellings are Standard and interchangeable.

Key Takeaways

• -뜨리다 and -트리다 are one suffix, two Standard spellings — fully interchangeable; neither is a mistake.
• It builds a forceful, sudden, often accidental transitive from a fall/break/collapse root — not neutral causation. English drop, knock over, smash, topple → -뜨리다.
• Each -뜨리다 verb pairs with an -어지다 intransitive on the same root: 떨어뜨리다 / 떨어지다, 깨뜨리다 / 깨지다. The object (을/를) picks the transitive; the subject-only (이/가) picks the intransitive.
• 빠뜨리다 covers both "drop into" and "leave out," mirroring 빠지다.
• It is a closed lexical set, not a productive rule — you cannot coin new -뜨리다 verbs. For general causation, use -게 하다 instead.