Correct

开槌

/ kāi chuí / 
Strokes

Example

As a Verb

(of an auction) start

1
Pāimàihuì
拍卖会
míngtiān
明天
shàngwǔ
上午
jiǔ
九
diǎn
点
kāi
开
chuí
槌
  
。

The auction will start at 9:00 tomorrow morning.