Much more than others; to a remarkable or unusually high degree (often used adverbially to indicate doing something more than others).
彼は人一倍努力して試験に合格した。
He passed the exam after making more effort than most people.
育児に対して人一倍気を配る母親だ。
She is a mother who pays more attention to childcare than most.
その選手は人一倍負けず嫌いだ。
That athlete hates losing more than most.