To acknowledge and consider a piece of information or a viewpoint, often one that has been newly presented, especially when making a decision or forming an opinion. You need to take your parents' advice on board instead of just assuming they don't know what they're talking about. Thank you for coming forward, we'll take your testimony on board before we make our final judgment on the matter.

To acknowledge and consider implementation of or action on a piece of information or a viewpoint, often one that has been newly presented. You need to take on board the advice of your parents instead of just assuming they don't know what they're talking about.