English rendering Show immaturity Literal translation: “Smell of milk”
Show an attitude or air of mental or physical immaturity.
Dictionary example 1
젖내 나는 행동.
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Writing text젖내 나다
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These idioms share an illustration on this site. Sharing an illustration does not mean they have the same meaning.
A silent film that writes the headword and its meaning.
Wean Stop feeding milk to an infant or young animal and let it grow by eating other food. 
Shared · 2 be weaned For an infant or young animal to stop feeding on milk. 
Struggle under pressure Strain so much over a difficult or awkward situation that nervous sweat appears. 
mark as one’s own To indicate that something is one’s own property. 
Spurn with contempt Despise something as utterly petty or dirty, refusing even to look back at it 
2 meanings Shared · 4 Crave food or possession Want very much to eat food or the like. 
Shared · 5 Speak until one’s mouth runs dry Speak repeatedly about another person or object 
foam at the mouth To speak in a state of extreme emotional agitation. 
become furiously worked up To become excited through extreme emotional agitation. 
2 meanings Make one's mouth water; arouse greed Stimulate the appetite. Browse in Hangul order.
WORDROW Korean Idioms 