IPA: /ˈtɛrəraɪz/
KK: /ˈtɛrəˌraɪz/
To frighten someone very much, often by using threats or violence.
The villain tried to terrorise the town with his threats.
Past: terrorised
Past Participle: terrorised
Terrorise → It is formed from "terror" (from Latin "terror", meaning great fear) and "-ise" (a suffix used to form verbs indicating to make or to become). The word "terrorise" means to make someone experience great fear or to instill terror in them.
Think of 'terror' as great fear and remember that to 'terrorise' means to make someone feel that fear.