Gacha' (GA-cha'): (verb) Catch up with, detect.
"Ma gacha' i polisia i sakke." = "The police caught up with the thief."
"Cha'-mu dumigeru sa' mågacha' hao sempre." = "Don't be a cheater, because you'll eventually get caught."
"Hu gacha' gue' gi karera, lao ti hu upos gue'." = "I caught up with him in the race, but didn't pass him."