단짝이 · 단짝을
best friend, inseparable buddy
Example
지수와 저는 초등학교 때부터 단짝이에요.
Jisu and I have been best friends since elementary school.
Word parts
Built on 짝 'partner, one of a pair', as in 짝꿍 (seatmate).
Good to know
Often used as 단짝 친구, 'best friend'.
Related words