Definition of welsh verb from the Oxford Advanced American Dictionary

 

welsh

 verb
verb
NAmE//wɛlʃ//
 
(also welch)[intransitive]welsh (on somebody/something)(disapproving)(informal)Verb Forms present simple I / you / we / they welsh
 
he / she / it welshes
 
past simple welshed
 
-ing form welshing
 
 
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to not do something that you have promised to do, for example to not pay money that you owe “I'm not in the habit of welshing on deals,” said Don.
See the Oxford Advanced Learner's Dictionary entry: welsh