How to sign “Don't understand” in ASL
The BSL sign for “Don't understand” isn't in our dictionary yet — it will be fingerspelled in BSL mode, never replaced with this ASL sign.
Step by step
- Sign UNDERSTAND: flick your index finger up beside your temple.
- Shake your head at the same time.
Practice tip
A head shake turns UNDERSTAND into DON'T UNDERSTAND.
Text-based guide researched from established ASL references (Lifeprint, university and public-health materials) and rewritten in original words. Signer-created photos and videos are a planned future upgrade.