위장해요 · 위장했어요 · 위장할 거예요 · 위장하세요
to disguise, to camouflage, to pose as
Example
범인은 택배 기사로 위장해서 건물에 들어갔어요.
The criminal got into the building disguised as a delivery driver.
Word parts
위 false+장 dress up
Literally 'falsely dressed up.'
Good to know
Not the same as 위장 (胃腸) 'stomach and intestines' — context tells them apart.