Smock/smɑːk/ Definition 1 of 3Pro Tip 1/3Protective Garment A smock is often worn as a protective layer to keep one's clothes clean. The potter wore a smock to avoid clay stains. Pro Tip 2/3Used by Artists Artists commonly wear smocks when working to protect their clothing from paint. He donned his smock before starting the mural. Pro Tip 3/3Not Always Formal Smocks are casual and not usually appropriate for formal events or meetings. She swapped her smock for a blazer before the interview.