A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Surge definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. See more.
Resurgence means coming back. Biker jackets are always coolââbut in certain decades they experience a resurgence, and suddenly you see them everywhere. There is nothing steady about resurgenceââa surge is a sudden gushââthink dancing fountain or an oil well that's just been tapped. Often, after a national tragedy, there is a resurgence in interest in family values and getting back to basics. In prosperous times, there's often a resurgence in sales of contemporary art.