"raise one's batting average" — Collocation dictionary inglés

More popular variant: raise one's average
Automatic translation (We do not guarantee its correctness): podnosić czyjś odbijając średnią
  1. raise verbo + average sustantivo
    Very loose collocation

    He raised his average to 2.7 in the second semester and to 3.5 last fall.

similar to "raise one's batting average" in Polish — inglés-Polish dictionary | see "raise one's batting average" in inglés

sustantivo
batting average = średnia ilość uderzeń (w krykiecie i baseballu)