The professional athlete achieved several major milestones bef | 📣 Quiz Masters 🇬🇧

The professional athlete achieved several major milestones before deciding to retire.

Answer: The unnecessary word(-s) here is(are) < ... major ... > .
TIP: A milestone is "a significant or major point in development", so it is unnecessary to include major.

The professional athlete achieved several major milestones before deciding to retire.