kāi​zhàn

go to war

开战 (開戰) kāi​zhàn
go to war verb
to initiate military hostilities or start a war

The two countries officially went to war over a border dispute.

battle verb
to engage in a fight, competition, or match

The highly-anticipated professional league officially kicked off today.

Frequency

Movie subtitles
7.81 per million appears in 3% of films
Written text
6.30 per million

Sources

Definitions
CC-CEDICT