1. cosmetic products used to hide blemishes, dark circles, or other imperfections on the skin
Usage: makeup/cosmetics
2. people or things that hide or keep something secret

Examples

• She applied concealers under her eyes to hide the dark circles.
• The makeup artist recommended different concealers for various skin tones.
• These concealers provide full coverage for acne scars.
• The spy used various concealers to hide the secret documents.
• Good concealers should match your skin tone perfectly.
• The criminals were skilled concealers of evidence.