verb, punctuation · to open (transitive or intransitive)

请把门打开。

verb, adjective · to operate or drive a vehicle

他学会开车了。

verb, noun, punctuation · to turn on, put in operation, operate, or run

他在公司开了个新项目。

verb · to hold or conduct an event or meeting

我们在学校开个会。

verb, punctuation · used as a directional complement meaning away or off

大家都走开了。

verb · to write out (a prescription, check, invoice etc)

麻烦给我开一张发票。

verb · to bloom or blossom, referring to flowers or leaves opening

春天到了，花儿都开了。

verb · (of ships, vehicles, troops etc) to start or depart

火车开了。

verb · to reach the boiling point

水还没烧开呢。

verb · to become unstitched or unseamed; to come apart at the seams

这件衣服的线开了。

measure word, verb · abbreviation for Kelvin or book format (kaiben)

这本书是十六开的。

noun · a measure of the purity of gold

这是十八开金的项链。

verb · to put forward, propose, or state (a price, condition, or requirement)

他开出的价格太高了。