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в большой

in a big

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phrase Uncommon #11,444
in a big The adjective ending changes with the noun and its grammatical case; the phrase can also mean “into a big” before a feminine noun.
RU: Она живёт в большой квартире.
EN: She lives in a big apartment.

Вы в большой спорт собираетесь возвращаться?

Are you planning to return to professional sports?

— Ice (2018)

Том в большой опасности.

Tom is in great danger.

Ей в большой спорт надо.

She should get into big-time sports.

— Ice (2018)

Девочка была в большой красной шляпе.

The girl was wearing a big red hat.