Korean · Pronunciation Guide
keu-da. An aspirated ㅋ with a real burst of breath, over the lip-flat ㅡ -- two features English speakers habitually trade for each other.
keuda
Equal weight, equal length, no peak. This is the aspirated member of a trio that also includes 그, with its plain ㄱ, and 끄다, with a tensed ㄲ -- three words sharing a vowel and differing only in how much breath and throat tension the first consonant carries.
Listen: 크다
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그 집은 아주 커요.
Geu jibeun aju keoyo.
That house is very big.
Listen: 그 집은 아주 커요.
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그 집은 아주 커요 contracts the verb to 커요, changing the vowel outright, and puts 그 at the front with the same ㅡ vowel but a plain consonant. Saying 그 and 크 back to back inside one sentence is the clearest available drill for the plain-against-aspirated contrast.
The two hard parts pull against each other: pushing the aspiration usually makes learners round the vowel, and getting the vowel flat usually makes them drop the breath. Do both at once. If the word comes out as 'koo-da' you have lost the vowel, and if it comes out as 'geu-da' you have lost the consonant.