beginner's luck

uncountable

Good luck supposedly enjoyed during a beginner's first attempt.

Japanese Meaning

初心者が初めて何かを試みた際にたまたま運が良くなり成功する現象 / 初心者の初体験における運の良さ

She attributed her tournament victory to beginner's luck, but everyone could see she had real talent.

彼女は大会での勝利を初心者の幸運だと説明したが、誰の目にも彼女には本当の才能があることがわかった。

Sense（1）

Good luck supposedly enjoyed during a beginner's first attempt.