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Related to welsh: Wales
welsh on (someone or something)
1. To fail to pay a debt owed on a gamble or bet. It is not certain if this phrase directly relates to the term "Welsh," meaning of or from Wales, but it may be considered offensive by Welsh people nonetheless. You welshed on your bet last time, so there's no way we're inviting you to poker night again! He tried to welsh on the money he owed the casino, and they sent a couple of thugs to go rough him up.
2. To fail to do what one has promised, agreed upon, or committed to. John welshed on his promise to help me with the report. You're never going to make it in this industry if you just welsh on your obligations like that.
3. To fail to provide someone what they are owed or what has been promised, committed to, or agreed upon. If you think you can welsh on me and get away with it, you've got another think coming. The CEO welshed on his investors, fleeing the country with nearly $3.5 million dollars of their money.
welsh on someone
to renege on a bet or an agreement made with someone. (Also spelled welch.) You had better not welsh on me if you know what is good for you. Max welshed on the mob boss and made a lot of trouble for himself.
welsh on something (with someone)
to renege on a bet or agreement made with someone. (Also spelled welch.) Max welshed on his bet with Lefty. That was not a wise thing to do. It is not wise to welsh on a bet.