It is a verb indicate things have been finished/done
already/to stop/then/afterwards/only/too much/enough!/used as a final particle to add emphasis
Definitions (粵典–words.hk)
詞綴、潮語
將原本雙音節嘅動詞、形容詞拆開、倒轉之後插入,表示已經。 an infix meaning "already", which is inserted into a disyllabic verb or adjective read out in reverse order
(報警>)警已報
(报警>)警已报
bou3 ging2 - ging2 ji5 bou3 to have reported the police
character, Classical-Chinese
Used after predicates, especially noun predicates, to express a new realization by the speaker. Compare 矣 (yǐ), which is used similarly but only after verbs. Sometimes expanded to 也已 or 也已矣, which are synonymous.
Definitions (Unihan)
already
finished
stop
Cangjie Input
SU
Definitions (HSK3.0)
HSK3 三级词汇表 #836
HSK3 二级汉字表 #255
HSK3 中等手写字表 #346
Examples (Tatoeba—Mandarin-English)
Mandarin
我只是不知道应该说什么而已……
我只是不知道應該說什麼而已……
wǒ zhǐ shì bù zhī dào yīng gāi shuō shén me ér yǐ ……