有言在先[yǒu yán zài xiān]
词典forewarn：预先警告，事先告知。
词典make clear beforehand：有言在先。
词典have agreed before：有言在先。
词典having previously pledged one's word：有言在先。
有言在先[yǒu yán zài xiān]
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make clear beforehand; forewarn; have agreed before; having previously pledged one's word; Let it be clearly understood before-hand.