above board
adjective, adverb uk/əˌbʌv ˈbɔːd/ us/əˈbʌv bɔːrd/
（计划或交易）光明正大的
If a plan or business agreement is above board, it is honest and not trying to deceive anyone.
The deal was completely open and above board. 这笔交易完全是光明正大的。
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