Definitions

1. noun

something that conceals or covers up (something, especially a blemish or imperfection in the skin)

“She applied a concealer to cover up the dark circles under her eyes.”

2. noun

a device that conceals or covers up (something, especially a camera or a microphone)

“The concealer in the spy’s briefcase was actually a hidden camera.”

3. verb

to conceal or cover up (something, especially a blemish or imperfection in the skin)

“She tried to conceal the scar on her forehead with makeup.”