타의 추종을 불허하다 (ta-e chu-jong-eul boo-reo-ha-da) – to be unbeatable/unrivalled; out of the league
Let’s first break down the phrase into individual words.
타 = others
추종 = follow/keep up
불허하다 = disallowed/disapproved
Therefore, you can look at 타의 추종을 불허하다 as:
Not allowing others/other people to keep up
Not sure if it makes sense to you but when someone doesn’t allow others to keep up (metaphorically or literally), it’s as if that someone is always ahead or higher than you.
In that respect, that someone is unbeatable or unrivalled in a certain skill of sorts.
그 선수 수영능력은 진짜 타의 추종을 불허해서 올림픽에 많은 상을 받았어.
That swimmer’s swimming ability is really unrivalled so she won many prizes at the Olympics.
사실은 부산 음식은 한국에서 타의 추종을 불허한다고 생각해.
To be honest, I think Busan’s food is unrivalled in Korea.