above board

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++aˌbove ˈboard / $ .ˈ../ adjective [not before noun]  LEGALhonest and legal 光明正大的 His plans for opening a coffee shop are completely above board. 他开咖啡馆的计划完全是光明正大的。From Longman Business Dictionaryabove boardaˈbove ˌboard (also aboveboard American English) adjectiveCOMMERCE honest and legalThe stock exchange aims to ensure that all deals are above board.aboveboard negotiations

aˌbove ˈboard adjectiveChineseSyllable  

Business honest and legal

above board
aˌbove ˈboard / $ .ˈ../ adjective [not before noun]
honest and legal:
    His plans for opening a coffee shop are completely above board.

above boardBrE /əˌbʌv ˈbɔːd/ 🔊NAmE /əˌbʌv ˈbɔːrd/ 🔊 adjective, adverblegal and honest; in a legal and honest way 合法而坦诚（的）；开诚布公（的）；公开（的）◆Don't worry; the deal was completely above board. 别担心，交易是完全合法的。🔊🔊 ORIGIN If card players keep their hands above the table (the board), other players can see what they are doing. 源于纸牌游戏。如果玩牌者将手放在桌上，其动作就会被其他玩牌者看得一清二楚。