As a Verb or Adjective: 1. To remove the scales from a fish. English = descale Note: 1. The following signs or sign expressions are suggested for 'descale'. Source: DeafConnectED, Melbourne Polytechnic. 2. Suggested sign #1 3. 4. Suggested sign #2 5. 6. Suggested sign #3 7. 8. Suggested sign #4 9.