장단이 · 장단을
rhythmic cycle (in Korean traditional music), beat; length (long and short)
Example
고수가 북으로 장단을 맞추면 소리꾼이 노래를 시작해요.
When the drummer sets the rhythm on the drum, the singer begins.
Word parts
장 long+단 short
Literally 'long and short': the pattern of strong and weak beats.
Good to know
장단을 맞추다 means to keep the beat, and figuratively to go along with someone.
Related words