开打

1. • (of a sports competition or match) to commence
2. • to break out

     of a war or battle

3. • to perform acrobatic or choreographed fighting (in Chinese opera)
4. • to brawl
5. • to come to blows

Character by character

• 开(kāi)open
• 打(dǎ)a semantically light, transitive verb that is combined with various grammatical objects to form compound verbs and verb-object phrases with a diverse range of meanings