gwangaegui hwanhoga jeongmal keosseo.

-의 is the Korean particle that often shows possession or relationship, similar to of or 's in English.

So:

• 관객 = audience / spectators
• 관객의 환호 = the audience's cheers / the cheers of the audience

In this sentence, 관객의 tells you that the cheering belongs to or comes from the audience.

They are doing different jobs:

• 관객의 = modifies 환호 and means the audience's
• 환호가 = marks 환호 as the subject of the sentence

So the structure is:

• 관객의 = whose cheering?
• 환호가 = the cheering is the thing being described

A natural breakdown is:

• 관객의 환호가 = the audience's cheering
• 정말 컸어 = was really big/loud

환호 means cheer, cheering, or acclamation. It usually refers to enthusiastic shouting or applause in support of someone or something.

It is a bit more formal or written-feeling than some everyday alternatives. In context, it suggests a strong positive reaction from the audience.

Yes, 크다 literally means to be big, but in Korean it is also commonly used for things like:

• sounds
• voices
• reactions
• amounts
• scale

So 환호가 컸어 literally means the cheering was big, but in natural English that usually becomes:

• The cheering was loud
• The audience's cheers were really loud
• The audience reaction was huge

This is a very natural Korean way to express intensity.

This is due to a regular contraction in Korean conjugation.

The dictionary form is 크다.
In the past informal form, it would historically be 크었어, but that contracts to 컸어.

Similar pattern:

• 크다 → 커 → 컸어
• 쓰다 → 써 → 썼어

So 컸어 is just the normal past-tense form of 크다.

컸어 is informal, non-polite speech.

You would use it with:

• close friends
• younger people
• people you speak casually with
• in diary-style narration or inner thoughts

The polite version would be:

• 관객의 환호가 정말 컸어요.

Same meaning, just more polite.

Because it is describing something that happened and is now being looked back on:

• 컸어 = was big/loud

This suggests the speaker is talking about a completed event, such as a concert, performance, game, or speech.

If you changed it to present tense:

• 관객의 환호가 정말 커.

that would sound like The audience's cheering is really loud, which fits a current or general situation instead.

No, not with this wording.

The subject here is 환호가, not 관객이.

So the sentence is specifically saying that the cheering was great/loud/intense, not that the number of audience members was large.

Compare:

• 관객이 정말 많았어. = There were really a lot of audience members.
• 관객의 환호가 정말 컸어. = The audience's cheering was really loud/huge.

가 marks 환호 as the subject being described.

Using 가 here feels natural when presenting or noticing the cheering itself as the main fact:

• 관객의 환호가 정말 컸어. = The audience's cheering was really loud.

If you used 는:

• 관객의 환호는 정말 컸어.

that would often feel more contrastive or topic-marking, like:

• As for the audience's cheering, it was really loud
• possibly implying comparison with something else

So 가 is the more neutral choice here.

In this sentence, 정말 means really or truly, and it intensifies 컸어.

So:

• 정말 컸어 = was really loud/big

Depending on context, 정말 can also express sincerity or emphasis, like truly, seriously, or for real, but here it is just a straightforward intensifier.

Even though the Korean literally says something like The audience's cheering was really big, natural English translations would usually be:

• The audience's cheers were really loud.
• The audience reaction was huge.
• The crowd cheered really loudly.

Which one is best depends on the context, but all capture the Korean idea well.

A rough pronunciation guide is:

• 관객의 → gwan-gae-ge
• 환호가 → hwan-ho-ga
• 정말 → jeong-mal
• 컸어 → keo-sseo

Put together:

gwan-gae-ge hwan-ho-ga jeong-mal keo-sseo

A couple of helpful notes:

• In everyday speech, 의 is often pronounced like 에 in this kind of phrase, so 관객의 may sound close to 관개게.
• 컸어 has a tense ㅆ sound in the second syllable: -sseo.

Yes. That is also correct.

• 관객의 환호가 정말 컸어 = the audience's cheering was really loud
• 관객들의 환호가 정말 컸어 = the spectators' cheering was really loud

The version with 들 makes the plural idea more explicit, but Korean often does not need plural marking when the meaning is already clear. So the original sentence sounds perfectly natural.