I’ll tell you what that meansDiré means “I’ll tell” or “I will say.” The indirect object can vary by context: te diré means “I’ll tell you,” while le diré and les voy a decir mean “I’ll tell him/her” and “I’m going to tell them,” respectively.
SP: Te diré lo que eso significa después de la reunión.
EN: I’ll tell you what that means after the meeting.