상투가 · 상투를
topknot (traditional hairstyle of married men)
Example
옛날에는 결혼한 남자가 상투를 틀었어요.
In the old days, married men tied their hair into a topknot.
Word parts
Boys wore a long braid until marriage, then tied a topknot as a sign of adulthood.
Good to know
The verb is 틀다: 상투를 틀다. Slang 상투를 잡다 means buying a stock at its peak.