Using 'welsh' as a verb usually implies dishonesty and can be offensive. After he lost, Mike began to welsh on our bet.
Pro Tip 2/3
Colloquial Usage
'Welsh' as a verb is informal and best suited for casual conversations. She might welsh on the deal if pressured.
Pro Tip 3/3
Avoid Stereotyping
Be careful when using 'welsh' to avoid perpetuating negative stereotypes about Welsh people. There's a risk of sounding prejudiced if someone misuses the term 'welsh'.