все, о чем

everything that

→ всё
phrase Rare #49,721
everything that Used before a relative clause to refer to everything someone mentions, dreams about, asks for, or otherwise relates to. Literally, «о чем» means “about which” or “about what,” but it is often translated simply as “that” in English. The form «все» is written without the accent in this exact term; in standard Russian spelling, «всё» may also be used when the pronunciation is intended to be clear.
RU: Все, о чем я мечтала.
EN: Everything I dreamed of.

Иначе все, о чем мы тут говорили, просто теория, так?

Otherwise, everything we've discussed here is just theory, right?

— Охота за «Красным Октябрем» (1990)

Все, о чем я мечтала.

Everything I ever dreamed of.

— Мулен Руж (2001)

Я прочитал все, о чем можно мечтать.

I’ve read everything one could dream of.

— Бойфренд из будущего (2013)

Я сделал все, о чем меня просили.

I did everything I was asked to do.

— Поле чудес (1989)