A lag spike is when a game freezes and then unfreezes. Or when the game go to a low FPS count. And this goes for tv's.
The game had a lag spike then, the lag spike disappeared.
APCR (armor pircing composit rigid) is a type of shell commonly used in WWII. When the shell is fired it looks like ap shell but when it hits a thing thock enough, tge soft oiter layer digs in but the dense core goes in.