This is how you sign Slow in American Sign Language.

How to sign

To sign "Slow" in American Sign Language (ASL), hold your non-dominant hand flat, palm facing down. Move your dominant hand slowly across the surface of your non-dominant hand.

To sign "Slow" in American Sign Language (ASL), place your non-dominant hand flat, palm down, and then gently glide your dominant hand over the non-dominant hand's surface.