To Unmask, To Expose
する verb
To pluck off someone's mask and departure it off somewhere away from their face, that is to unmask or to expose someone.
てきはつする
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私は警察官ですが、麻薬の密売組織を摘発するような機会に出くわしたことがありません。
I’m a policeman but I’ve never had the chance to bust a drug trafficking ring.