Definition
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yn erbyn
Mae 'yn erbyn' yn golygu gwrthwynebu neu fod yn erbyn rhywun neu rywbeth.
'Yn erbyn' means to oppose or to be against someone or something.
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Mae e'n sefyll yn erbyn y gyngor.
He stands against the council.
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Mae hi'n erbyn y syniad o fynd i'r parti.
She is against the idea of going to the party.
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Rydym yn erbyn y penderfyniad hwn.
We are against this decision.