A press lid is not a commonly used term, but it can refer to a lid that is used in a press or a machine that presses lids onto containers. However, the term "lid" is more commonly used in the context of journalism and politics. In this context, a "lid" is a term used by White House press secretaries to indicate that there will be no news coming out of the White House that day. It can also be called a "full lid". Once a lid is called, reporters know that they will not miss any significant happenings by leaving the White House premises or turning their attention to other stories. However, 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.