IPA: /kɜːrˈteɪl/
KK: /kɜrˈteɪl/
To make something shorter or to reduce its amount or extent.
The school decided to curtail the summer vacation by two weeks.
Past: curtailed
Past Participle: curtailed
Curtail → It is formed from "curtus" (meaning short) and the suffix "-ail" (a variant of the Old French "-ailler", meaning to cut). The word "curtail" means to cut short or reduce something.
Think of something being made 'short' ('curtus') — that's why curtail means to cut something short.