Lateralization 유음화: ㄴ → ㄹ Next to ㄹ (신라 → 실라)

The ancient Korean kingdom is written 신라 but romanized Silla — with two L's and no N in sight. That single fact is the whole rule on this page. Lateralization (유음화) turns a ㄴ into [ㄹ] whenever it touches ㄹ, in either order, and the two sounds fuse into one long, held [ll]. It is why 연락 ("contact, getting in touch") comes out [열락] yeollak, why 설날 (Lunar New Year) is [설랄], and why 원래 ("originally") — a word you'll say constantly — is [월래]. Where the nasalization rules made a nasal win over a liquid, here the liquid wins.

The rule in one line

Any ㄴ next to ㄹ is pronounced [ㄹ], so the cluster surfaces as a doubled [ㄹㄹ]. This works both directions:

연락 → [열락]: the ㄴ of 연, touching the ㄹ of 락, becomes [ㄹ] → a held [열락].

설날 → [설랄]: here the order is reversed — the ㄹ of 설 pulls the ㄴ of 날 into [ㄹ]. (Then 날에는 links across to [라레는].)

Why it happens: ㄹ is the stronger coronal

ㄴ and ㄹ are made at the same place — both are coronal, formed with the tongue tip at the alveolar ridge. When two consonants that close as an [n]…[l] (or [l]…[n]) cluster bump together, Korean resolves them to a single, uniform articulation rather than pronouncing two distinct sounds. And the sound it picks is the lateral [+lateral] feature spreads across the whole cluster, overwriting the ㄴ. Both segments come out as [l], held long — a geminate [ll].

Why does the liquid win here, when a nasal won in 종로 → [종노]? Because the competition is different. In 종로 the ㄹ was up against a nasal at a different place (ㅇ/ㅁ), and the nasal feature spread. Here the ㄴ is up against a lateral at the same place, and lateral spreading is the stronger local process. The upshot is a clean division of labor you can rely on: ㄴ + ㄹ or ㄹ + ㄴ → [ㄹㄹ], always doubled.

원래 → [월래]: the ㄴ of 원 becomes [ㄹ] before the ㄹ of 래. This tiny word ("originally, in the first place") is everywhere in speech — say it [월래], never [원래].

ㄴ + ㄹ: mostly Sino-Korean

Most ㄴ + ㄹ examples are Chinese-derived compounds, where a ㄴ-final morpheme meets a ㄹ-initial one:

관리 → [괄리]: 관's ㄴ → [ㄹ] before 리. Likewise 편리 → [펄리] ("convenient"), 진리 → [질리] ("truth"), 난로 → [날로] ("heater").

편리 → [펄리] → 편리해요 [펄리해요].

신라 → [실라] — the romanization Silla has been telling you this all along.

ㄹ + ㄴ: native words too

When the ㄹ comes first — often in native Korean compounds — it reaches forward and lateralizes a following ㄴ:

물놀이 → [물로리]: the ㄹ of 물 turns the ㄴ of 놀 into [ㄹ], then 놀이 links to [로리]. The same happens to 칼날 → [칼랄] ("blade"), 줄넘기 → [줄럼기] ("jump rope"), and 실내 → [실래] ("indoors").

실내 → [실래]: 실's ㄹ lateralizes 내's ㄴ.

Coaching the sound: a long [ll], not a flap

Two things go wrong for English speakers, in opposite directions.

First, don't keep the ㄴ separate. English is perfectly happy with [nl] and [nr] clusters — "unless," "only," "one-liter," "Henry" all keep a distinct n. So the instinct is to say 신라 as "sin-ra" with a crisp n. Korean can't do that; the two coronals merge. Say [실라], with no n at all.

Second, don't roll or flap it. The result is a lateral [l] — the L in English "call" or "silly" — and it is held long, like the double L you'd feel in "full length" said quickly. It is not the tapped/flapped ㄹ you hear between vowels (as in 사랑), and it is certainly not a Spanish trill. Let the tongue tip rest against the ridge for a beat: [실ㄹ라], [열ㄹ락].

Default, not automatic — the exceptions ahead

One honest caveat before you over-apply this. Lateralization is the default for ㄴ next to ㄹ, but it is not 100% automatic. A specific set of longer Sino-Korean words go the other way — the ㄴ + ㄹ stays [ㄴㄴ] instead of fusing to [ㄹㄹ]. Compare 생산량 → [생산냥] (not [생살량]) with everything on this page. The split is morphological and partly has to be memorized; it gets its own exceptions page. For now, treat [ㄹㄹ] as your reliable default and just know that a small, learnable set of words breaks it.

Common Mistakes

1. Keeping a distinct ㄴ in 신라, 연락. The n disappears; both sounds are [ㄹ].

2. A single flap instead of a held [ll]. 연락 is a long, steady [열락], not a quick tapped r.

3. Missing it in the ㄹ + ㄴ direction. 설날 is [설랄], not [설날] — the leading ㄹ lateralizes the ㄴ too.

4. Over-applying it to the exception words. Not every ㄴ + ㄹ lateralizes: 생산량 is [생산냥], not [생살량]. When a two-syllable Sino base is followed by a bound suffix, the cluster nasalizes instead — see the exceptions.

Key Takeaways

• ㄴ next to ㄹ becomes [ㄹ], both directions: ㄴ + ㄹ (신라 [실라], 연락 [열락], 원래 [월래]) and ㄹ + ㄴ (설날 [설랄], 물놀이 [물로리]).
• It happens because ㄴ and ㄹ share a place, and the lateral spreads across the cluster — the liquid wins, unlike in 종로 [종노] where a nasal won.
• The output is a long, held [ll] — like English "call," doubled — not a flap and not a trill; and there's no leftover n.
• It's the default but not automatic: a set of Sino-Korean words keep [ㄴㄴ] instead (생산량 [생산냥]) — covered on the exceptions page.
• The official romanizations already encode it: Silla, yeollak, seollal, Hallasan — every one shows a double L.