When you hear this word, you know someone's in trouble. It's what the police do after a crime, what your boss does when money goes missing, or what your mom does when the ulam for dinner mysteriously disappears. It's the formal version of "usisa-in" or "alamin kung sino ang may sala." It's the official start of the chismis becoming a full-blown case. "Kailangan nating **imbestigahan** kung sino ang kumain ng huling piraso ng leche flan!"