When the White House calls a "lid," it means that there will be no news coming out of the White House that day. This term is used by White House press secretaries to indicate that there will be no more public appearances or statements from the President that day. However, its important to note that calling a lid does not necessarily mean that the Presidents workday is over or that no more newsworthy events will happen that day. The President may still have private meetings, phone calls, or other activities that are not open to the press. Additionally, a lid is not an absolute guarantee: in rare circumstances, the lid may be "lifted" if there is a significant event or development.