Say it with your chest means: It is to say it clearly and authoritatively. (in Community Dictionary, added by Danica Bruce)

What else does Say it with your chest mean?

  • It is important to speak confidently, without worrying about the potential backlash. This is often used when someone says something controversial, something that could get them into trouble, or something to make fun of somebody. A person may try to hide their views by changing their words to make it less clear or less harsh for the listener. The speaker can do this either consciously or unconsciously, which can reveal something about their thinking about the topic. (in Community Dictionary, added by Javon Vang)
  • Push your chest forward when you’re talking to someone to appear stronger than you really are. (in Community Dictionary, added by Hadassah Cannon)