1
drop by/in/into + place
表示事先没有预约的短暂拜访；'drop in on + 人' 意为顺便看望某人。
I'll drop by your office after lunch.
我午饭后会顺便到你的办公室坐坐。
落下；掉下
dropping — present participle of drop
先理解核心含义，再看它在真实句子里的用法。
落下；掉下
To fall down, especially straight down or suddenly to the ground.
I'll drop by your office after lunch.
我午饭后会顺便到你的办公室坐坐。
Of a liquid: to fall in drops or droplets.
To fall (straight down) under the influence of gravity, like a drop of liquid.
To fall or sink quickly or suddenly to the ground.
To collapse in exhaustion or injury; also, to fall dead, or to fall in death.
drop
Base
原形
drops
3rd person
第三人称单数
dropping
-ing
现在分词
dropped
Past
过去式
dropped
Past participle
过去分词
She drops the book.
她掉了书。
He is dropping the ball.
他正在丢球。
They dropped the plan.
他们放弃了计划。
He accidentally dropped his keys while unlocking the door.
他开门时不小心把钥匙弄掉了。
The apple dropped from the tree and rolled into the grass.
苹果从树上掉下来，滚进了草丛里。
She is dropping the ice cubes into the glass one by one.
她正把冰块一个一个地放进杯子里。
表示事先没有预约的短暂拜访；'drop in on + 人' 意为顺便看望某人。
I'll drop by your office after lunch.
我午饭后会顺便到你的办公室坐坐。
常用于表示不再讨论、不再继续或取消某事物。
Let's drop the subject and talk about something else.
我们别谈这个话题了，说点别的吧。
也可说 drop from X to Y，表示从某数值降到另一数值。
The price of oil dropped by 15% last month.
上个月油价下跌了15%。
强调物体从手中或高处落下；dropped 是过去式和过去分词。
She dropped her phone into the pool.
她把手机掉进了游泳池里。
Not this
He dropped school last year.
Use this
He dropped out of school last year.
表示“辍学、退出学校”时，drop 是短语动词 drop out of，必须用 out of 接 school；drop 单独不能接 school 作宾语。
Not this
I will drop your house after work.
Use this
I will drop by your house after work.
表示“顺路拜访”时，drop 是不及物动词，须与 by/in/into 等介词搭配才能接地点；drop 直接加地点会被理解为“把房子放下”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
顺便拜访；串门
Drop by my office when you have a moment.
有空来我办公室坐坐。
退出；退学
He dropped out of school at sixteen.
他十六岁辍学。
下降；减少
Demand for the product has dropped off sharply.
对该产品的需求急剧下降。
落后；掉队
If you don't study, you'll drop behind your classmates.
如果你不学习，就会落后于同学。
退选一门课程
I'm going to drop the course because I don't have time.
我打算退掉这门课，因为我没有时间。
不再谈论某个话题
Let's drop the subject and talk about something else.
我们别再谈这个话题了，说点别的吧。
犯错误；搞砸
We were counting on him, but he dropped the ball at the last minute.
我们原本指望他，但他在最后关头搞砸了。
沧海一粟；微不足道
A ten-dollar donation is a drop in the bucket for such a large charity.
十美元的捐款对这么大的慈善机构来说只是沧海一粟。
一有机会就；动不动就
He gets angry at the drop of a hat.
他动不动就生气。
（出自 Snoop Dogg 的歌曲《Drop It Like It's Hot》）像被烫到一样把身体放低。
When the music starts, everyone drops it low on the dance floor.
音乐一响，大家都在舞池里把身体压得很低。
Use dropping naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：一滴水从高处垂直滴落，drop 的 d 像下坠的水珠；看到 drop 就想到‘落下、下降、减少’。
语域：neutral 常见场景：日常对话、新闻报道、商务报告 drop 作动词表示“下降、减少”时，语气中性，多用于描述数量、程度或价值等的变化，日常口头交流和书面表达中都比较常见。
In BrE, drop is /drɒp/ and rhymes with top, stop, shop, cop, hop (all /ɒp/). In AmE the vowel is /ɑː/, so these words rhyme with /ɑːp/. Beware drip /drɪp/: it shares the initial 'dr' spelling but has a different vowel sound, so it does not rhyme with drop.
Dictionary facts from ECDICT, WIKTIONARY.