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
下降；减少；放下；垂下；停止；终止；顺便拜访；串门；滴落；使滴下
To fall down, especially straight down or suddenly to the ground.
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.
落入某种特定状态或状况。
To fall into a particular condition or state.
因不再维持而结束；中止,停止。
To come to an end (by not being kept up); to lapse, to stop.
在状况、程度、价值等方面减少、下降或减弱。
To decrease, diminish, or lessen in condition, degree, value, etc.
因跟不上前面的人而落后或掉队。
To fall behind or to the rear of a group of people, etc., as a result of not keeping up with those at the front.
通常后接 by、in 或 into:指人非正式地或未经预约地拜访某人或某处。
Usually followed by by, in, or into: of a person: to visit someone or somewhere informally or without a prior appointment.
退出下注。
To drop out of the betting.
以滴状或少量滴下(液体)。
To drip (a liquid) in drops or small amounts.
移到较低位置；使下垂；放下。
To move to a lower position; to allow to hang downwards; to lower.
降低；使变小。
To reduce; to make smaller.
指动物(通常是羊)产(仔)；指鸟下(蛋)。
Of an animal (usually a sheep): to give birth to (young); of a bird: to lay (an egg).
(通常在交谈中)随意或顺带提到(某事)。
To mention (something) casually or incidentally, usually in conversation.
将(信件等)投入邮筒；由此指以漫不经心的方式发送(信件、电子邮件或其他消息)。
To let (a letter, etc.) fall into a postbox; hence, to send (a letter, email, or other message) in an offhand manner.
用打击、枪击等使(某人或某物)倒地；击落,射落；杀死。
To make (someone or something) fall to the ground from a blow, gunshot, etc.; to bring down, to shoot down; to kill.
从车辆上放下(某人或某物)；停下并卸下(某人或某物)；使下车。
To set down (someone or something) from a vehicle; to stop and deliver or deposit (someone or something); to drop off.
降低(声音、嗓音等)的音高或音量。
To lower (a sound, a voice, etc.) in pitch or volume.
不再关心(某人或某事)；不再参与(讨论、话题等)。
To cease concerning oneself over (someone or something); to have nothing more to do with (a discussion, subject, etc.).
处理或摆脱(某物)；失去,移除。
To dispose or get rid of (something); to lose, to remove.
不再包含(某物),如同从名单上划掉；开除,剔除,驱逐。
To cease to include (something), as if on a list; to dismiss, to eject, to expel.
取消或不再参加(预定的课程、活动或项目)。
To cancel or cease to participate in (a scheduled course, event, or project).
未能写出或(尤指)未读出(音节、字母等)。
To fail to write, or (especially) to pronounce (a syllable, letter, etc.).
以唱片骑师的方式播放(一段音乐)
To play (a portion of music) in the manner of a disc jockey.
表演(说唱音乐)
To perform (rap music).
(意外地)输掉(比赛等)
To (unexpectedly) lose (a competition, game, etc.).
(外野手)因接球脱手而未能将(击球员)杀出局
Of a fielder: to fail to dismiss (a batsman) by accidentally dropping a batted ball that had initially been caught.
通过踢反弹球射门得分
To score (a goal) by means of a drop kick.
进入更基本的界面
To enter a more basic interface.
向(用户)呈现更基本的界面
To present (the user) with a more basic interface.
一般现在时
She drops the book.
她掉了书。
现在进行时
He is dropping the ball.
他正在丢球。
一般过去时
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。
用法提示：本句使用过去式'dropped'，作为及物动词，表示不小心使某物掉落。
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。
用法提示：本句使用过去式'dropped'，作为不及物动词，表示物体自然掉落。
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。
用法提示：本句使用现在分词'dropping'，作为及物动词，表示将某物放入某处。
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。
与 drop 最接近，常可互换；但 fall 更强调不由自主地落下，drop 可含人为放下之意。
较正式，语气中性；常指沿斜面或阶梯向下，drop 更口语化。
强调快速、猛烈地坠落，隐含幅度大；drop 不含此强烈程度。
强调突然而猛烈地向下冲，常指进入水中或大幅下降；drop 语气较弱。
常指人或物翻滚着向下掉，drop 只是一般垂直下落。
grammar · medium
易错句子He dropped school last year.
正确表达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。
grammar · medium
易错句子I will drop your house after work.
正确表达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”。
针对“落下/掉下”这一含义，反义词为rise（上升）。drop指物体向下移动，rise指向上移动。
针对“下降/减少”的含义，反义词为increase（增加）。drop表示数量或程度减少，increase表示增多。
针对“放下/垂下”的含义，反义词为lift（举起）。drop表示使物体下落，lift表示主动向上举起。
针对“中止/停止”的含义，反义词为continue（继续）。drop表示终止某活动，continue表示持续进行。
针对“落后/掉队”的含义，反义词为keep up（跟上）。drop指落在后面，keep up指保持与前面相同的速度。
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。
价格常用作 drop 的主语，表示价格下跌。
温度可以 drop，表示气温下降。
比率或速度可 drop，表示数值下降。
水平或程度会 drop，表示降低。
需求量可 drop，表示减少。
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。
Dictionary facts from ECDICT, WIKTIONARY.