LiquidCrystal::blink
void LiquidCrystal::blink();
This function enables cursor blinking. The cursor blinks by default, so you only need to use it to reenable blinking after disabling it.
Usage:
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
lcd.begin(16, 2);
//some stuff that makes us want to turn blinking off
lcd.noBlink();
//do some stuff, want blinking on
lcd.blink();