An example of forefinger is the finger used to point at someone.
The officer on duty was a handsome, elegantly dressed man with a diamond ring on his forefinger.
He shook his head again and wiped moisture from his eyes with the thumb and forefinger of his other hand.
Examples are- guruh, a rumbling noise, gumuruh, to make such a noise; tunjuk, to point, telunjuk, the forefinger; chuchuk, to pierce, cheruchuk, a stockade.
To do this, take each string individually between your thumb and forefinger and pull them away from the fretboard five or six times.