As a noun:
* The spy used a disguise to infiltrate the enemy's base.
* Her disguise was so convincing, no one suspected she was an undercover agent.
* The magician's disguise was a clever trick to fool the audience.
As a verb:
* He disguised himself as a street vendor to avoid being recognized.
* The thief disguised the stolen jewels as ordinary rocks.
* The soldiers disguised their weapons under blankets.
* The chef disguised the vegetables in a delicious sauce to make them appealing to picky eaters.
Figurative usage:
* He disguised his fear with a brave facade.
* Her laughter disguised the pain she was feeling.
* The company disguised its financial losses by manipulating its reports.