tell sb what one’s real intentions are;put all one’s cards on the table; give the bottom line 他的來(lái)訪我們還沒(méi)有公布，我先給你交個(gè)底。We have not yet announced his visit,and here I just let you know in private./我們把底統(tǒng)統(tǒng)都交了。We have shown you our bottom line.or:We hide nothing from you.