Let's learn about "그녀는 입이 가벼워요"

그녀는 입이 가벼워요 : She’s a blabbermouth; She’s a tattler: She’s a tattletale; She has a big mouth: She can’t keep a secret

* 말이 많다 / 허풍이 심하다 : have a big mouth

그녀는 입이 무거워요 : She can keep secret

ex)

A. 난 걔가 비밀을 지킬 줄 알았어 : I thought I could trust her to keep a secret.

B. 무슨 소리야? 걔 입 가벼운 거 모르는 사람이 없는데 : What? Everyone knows she’s a blabbermouth

[other expressions]

- 그녀는 입이 가볍다. (to younger people or friends)

- 그녀는 입이 가볍네. (to younger people or friends)

- 그녀는 입이 가벼워. (to younger people or friends)

- 그녀는 입이 가볍네요. (honourific by ‘-요’)

- 그녀는 입이 가벼워요. (honourific by ‘-요’)

- 그녀는 입이 가볍습니다. (formal; more honourific by ‘스-’)

- 그녀는 입이 무겁다. (to younger people or friends)

- 그녀는 입이 무겁네. (to younger people or friends)

- 그녀는 입이 무거워. (to younger people or friends)

- 그녀는 입이 무겁네요. (honourific by ‘-요’)

- 그녀는 입이 무거워요. (honourific by ‘-요’)

- 그녀는 입이 무겁습니다. (formal; more honourific by ‘스-’)

[explanations]

* 그 : that

* 녀 / 여 : woman

* 그녀 : she

* -은 : a particle makes 그녀 subjective after  a word ends in a vowel

* 입 : mouth

* -이 : a particle makes 입 the topic of the sentence after  a word ends in a consonant

* 무거운 : heavy; weighty

* 무겁다 : be heavy; be weighty

* 입이 무겁다 : one's lips are sealed; be confidant; don't have a big mouth; be tight-lipped

[ㅂ 불규칙 규칙(V irregular rule)]

(1) the ㅂ of 무겁다 is not 'B' sound but 'V' sound and V consists of ㅂ + 옛이응  ‘ㆁ’. these days  V sound changed into '우' for easy pronunciation

- See : https://m.blog.naver.com/nurisejong/221050681781

(2) 무거운: an adjective form of 무겁다; this is from 무거 + ㅂ(V sound consists of ㅂ + 옛이응  ‘ㆁ’; this changed into '우') + ㄴ(a suffix makes a verb into an adjective)

(3) 무거워 : 무겁(the stem of 무겁다; ㅂ(V sound) changed into 우) + -어(a non-honourific descriptive verb ending suffix)

* 무겁습니다 : 무겁(the stem of 무겁다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)

* 가벼운 : light; not heavy; not weighty

* 가볍다 : be light; be not heavy; be not weighty

* 입이 가볍다 = 말이 많다 : have a big mouth

- 걔한테 말했어. 너 정말 입이 가볍구나! : Did you tell it to her. you have a big mouth!

- 우리 누나는 입이 가벼워 : My elder sister have a big mouth

- 난 입이 가벼운 사람 좋아하지 않아 : I don't like people who have a big mouth

- 나 입이 가벼운 사람 아니야! 뭐든 말해봐 : I don't have a big mouth. you can tell me anything

[ㅂ 불규칙 규칙(V irregular rule)]

(1) the ㅂ of 가볍다 is not 'B' sound but 'V' sound and V consists of ㅂ + 옛이응  ‘ㆁ’. these days  V sound changed into '우' for easy pronunciation

- See : https://m.blog.naver.com/nurisejong/221050681781

(2) 가벼운: an adjective form of 가볍다; this is from 가벼 + ㅂ(V sound consists of ㅂ + 옛이응  ‘ㆁ’; this changed into '우') + ㄴ(a suffix makes a verb into an adjective)

(3) 가벼워 : 가볍(the stem of 가볍다; ㅂ(V sound) changed into 우) + -어(a non-honourific descriptive verb ending suffix)

* 가볍습니다 : 가볍(the stem of 가볍다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix)

* a verb + -다 / -네 / -어 : a non-honourific descriptive verb ending suffix

* a verb + -네 / -어 + -요 : an honourific verb ending suffix

* a verb +  -습니다 / -ㅂ니다 : an honourific descriptive verb ending suffix by '스-' / '-ㅂ'

* 걔 : he or she (non-honourific word means "그 아이”(that boy or girl) / "그 사람(that man or that woman is younger than us)

* 비밀을 지키다 : keep a secret

* -ㄹ 줄 알았다 / -를 줄 알았다 / -을 줄 알았다 : I thought that I could trust someone to do ~

* 무슨 소리야? = 무슨 말이야? : What do you mean? / What?

* 가벼운 거 : a short form of 가벼운 것을

* -를/-을/-ㄹ 모르는 사람이 없다 : Everyone knows that ~

* -는데 : A sentence-final ending used to admire something while anticipating the listener's response