What is aboveboard? Give a brief introduction.

1, aboveboard, China idiom, pronounced as guāngmíngl iluò, means to describe people's honest and frank behavior, and there is no privacy ambiguity.

2. Synonym: Frankly speaking.

3, antonym: ulterior motives.

4. Idiom usage: combination; As predicate, attribute and adverbial; With praise.

5, idiom source:

(1) Notes to the Book of Jin: "When a gentleman walks, when _ (thunder) falls, it is like the sun and moon in Jiao Ran."

(2) Song Zhuxi's "Zhuzi Language" Volume 74: "For example, an aboveboard person is a good person, and an ignorant person is not a good person."