An op is a medical operation: a doctor puts you to sleep, works on your body, and then you wake up. Friends, especially in Britain, cut the long word down and say, “I’m having an op next week,” the way they say exam instead of examination.

An op is op 是 a medical operation醫療的手術: a doctor醫生 puts you to sleep讓你睡著, works on your body在你身上動刀, and then you wake up然後你醒來。 Friends朋友之間, especially in Britain尤其在英國, cut the long word down把長字剪短, and say說: "I'm having an op next week" 我下週要動個手術, the way就像 they他們 instead of examination不說 examination, say exam而說 exam 一樣。

It is home talk, not form talk. A hospital letter will still say operation; a text from your aunt will say op. In American English people more often say surgery.

It它 is home talk是家常話, not form talk不是表格上的話。 A hospital letter醫院的信 will still say還是會寫 operation; a text from your aunt你阿姨傳來的訊息 will say會寫 op。 In American English在美式英文裡, people人們 more often比較常 say surgery說 surgery。

You will meet other ops that look the same and are not this word: in games, OP can mean “too strong,” and online it can mean “the person who started the post.” Those are different. This one is the hospital one. Though actually, even there it can sound a bit old-casual — younger American shows almost always say surgery.

You你 will meet會遇到 that look the same長得一樣, and are not this word卻不是這個字的 other ops其他 op: in games在遊戲裡, OP can mean可以是 "too strong" 太強, and online而在網路上, it can mean可以是 "the person who started the post" 開串發文的那個人。 Those are different那些是別的字。 This one這一個 is the hospital one是醫院的那個。 Though actually不過其實, even there就算在醫院這個意思裡, it它 can sound a bit old-casual也可能聽起來有點舊式的隨口 — younger American shows比較年輕的美國影集 almost always say surgery幾乎都說 surgery。