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I give you my word and I'll never go back on it.
一言为定，决不反悔。
《新英汉大辞典》
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You should never go back on your word, if possible.
如果可能，永远不要说话不算数。
youdao
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I mean what I say and shall never react from [go back on] my words.
我讲话是算数的，决不反复。
《新英汉大辞典》
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I mean what I say and shall never react from [go back on] my words.
我讲话是算数的，决不反复。
《新英汉大辞典》