"Does dim dis gyda fi."

Translation: I do not have a dice.

[KierenMcCormack]

Isn't the singular of dice, die?

[jeff121271]

Maybe it's another weird UK English thing.

[kebukebu]

Yes, I am also confused by "a dice". Is "dis" singular or plural?

[Malwen]

According to GPC, the Welsh online dictionary, dis is singular. According to Chambers British English dictionary the singular of dice can be either dice or die.