chef in English:

chief executive (officer)

The fact that educated Americans in general no longer share understandable background knowledge is a chief cause of their inability to communicate effectively.

In 776 B.C., the first Olympic Games were held at the foot of Mount Olympus to honor the Greeks' chief god, Zeus.

I had many reasons, love being chief among them.

The chief engineer did research hand in hand with his assistant.

As the date didn't work for the section chief, it was necessary to completely reorganize the drinking party.

We'll have to organize the drinking party all over again as the section chief can't make it now.

To my chief strategist, David Axelrod, who's been a partner with me every step of the way. To the best campaign team ever assembled in the history of politics! You made this happen, and I am forever grateful for what you've sacrificed to get it done.

A new chief of the security forces has just been appointed

O.K. chief. It's gonna cost you two century notes.

'major', 'key' or 'important' can be a synonym of te world 'chief'

Ireland’s chief cities are Dublin, Cork, Galway, Limerick and Waterford.

The chief clerk is not a hardworking man, but gets ahead rapidly because he knows how to curry favor with his superiors.

The election of the village headman had been postponed.