English rendering Have hidden substance Literal translation: “The inner flesh grows”
Have substance without showing it outwardly.
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Writing text속살 찌다
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A silent film that writes the headword and its meaning.
develop a lacquer rash For lacquer exposure to make the skin sore and erupt in rashes. 
Have twitching muscles For muscles to quiver or twitch 
Allow no one to touch it Prevent anyone from touching something at all. 
feel firsthand To experience personally. 
Become skin and bones Become unsightly through emaciation. 
2 meanings Make good use of one’s strength Perform one’s role using one’s strength or physique 
trim the fat To eliminate things that are not essential. 
Still be childish Literally, an infant’s cradle-cap scabs have not all fallen from the head; remain immature 
Dress oneself up Groom oneself and dress stylishly. 
be tenacious To have extraordinarily enduring, persistent nerve. Browse in Hangul order.
WORDROW Korean Idioms