English rendering Hide evil under a gentle guise Literal translation: “Wear sheepskin”
Pretend outwardly to be gentle and kind to hide a vicious nature.
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Writing text양가죽을 쓰다
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A silent film that writes the headword and its meaning.
know absolutely nothing To know nothing at all. 
Have absolutely nothing Have nothing whatsoever 
2 meanings Be utterly insignificant or tiny Be utterly insignificant. 
Put on airs despite being insignificant Of an insignificant person, do something pretentious. 
need at least something to start with An expression meaning that one must possess at least a little of something to attempt anything. 
Stay keenly alert Concentrate, keep one’s nerves sharply alert, and prepare to respond immediately 
Extend one’s influence Gradually exert influence on a target with a particular purpose 
4 meanings Stride vigorously; swagger; proliferate; flap wings Walk swinging both arms strongly in alternating directions. 
know jack shit Coarsely, to know nothing. 
Be a nobody Vulgarly, have no ability worth boasting of Browse in Hangul order.
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