基本要點
1.off用作名詞時的基本意思是“起跑線，（闆球）擊球手對面的半場”，主要用于非正式用語。
2.off既可用作可數名詞，也可用作不可數名詞。常與the連用。
3.off用作動詞時的意思是“（非正式）殺死（某人）；（非正式）離開”，是非正式用語。
4.off既可用作及物動詞，也可用作不及物動詞。用作及物動詞時，後常跟簡單賓語。
單詞釋義
根據《柯林斯英漢雙解大詞典 》：
PREP If something is taken off something else or moves off it, it is no longer touching that thing. (從某物) 下來
ADV Off is also an adverb. 下 [ADV after v]
PREP When you get off a bus, train, or plane, you come out of it or leave it after you have been travelling on it. 下 (公車、火車、飛機等)
ADV Off is also an adverb. 下 (公車、火車、飛機等) [ADV after v]
PREP If you keep off a street or piece of land, you do not step on it or go there. 不在 (某街道、某地等) 上
ADV Off is also an adverb. 不在 (某街道、某地等) 上地
PREP If something is situated off a place such as a coast, room, or road, it is near to it or next to it, but not exactly in it. 在離 (某地) 不遠處
ADV If you go off, you leave a place. 離開
ADV When you take off clothing or jewellery that you are wearing, you remove it from your body. (從身體上脫、摘) 下 [ADV after v]
ADV If you have time off or a particular day off, you do not go to work or school, for example, because you are sick or it is a day when you do not usually work. 不在工作中地; 不在學習中地
PREP Off is also a preposition. 不在工作中; 不在學習中
PREP If you keep off a subject, you deliberately avoid talking about it. 避開 (某話題)
PREP If there is money off something, its price is reduced by the amount specified. 減 (價) [amount PREP n]
ADV Off is also an adverb. 減 (價)
ADV If something is a long way off, it is a long distance away from you. 離 (某處) 遠 [n/amount ADV]
ADV If something is a long time off, it will not happen for a long time. 離 (某時) 遠 [n/amount ADV]
PREP If you get something off someone, you obtain it from them. 從 (某人那裡得到) [口語]
詞組短語
off and [口]忽然
off with （用于祈使句）去除；脫掉
off of 從
go off 離開；進行；變質；睡去
right off 立刻；馬上
from off 從…離開
off and on 斷斷續續地，時不時地
on off 開關離合通斷雙位式
straight off 立即；馬上
from the off [英國俚語]從頭開始；從起點開始，從一開始
雙語例句
A button had come off my coat.
我的外套掉了一顆紐扣。
I hacked the dead branches off.
我把枯樹枝砍掉了。
I cleaned the mud off my shoes.
我刷掉了鞋子上的泥。
