drop /drɔp/ I. n. ［c］1. 滴，点滴：rain-drops雨点；in drops (drop by drop)一滴滴地 a drop of… 一滴：a drop of water 一滴水 2. 降低(可加不定冠词);下跌;落下:watch the drop of the parachutists from the plane 观察跳伞者从飞机上跳伞；a sudden drop in the temperature 气温的突然下降  ‖II. vt. & vi.(dropped; dropping) 1. 使滴下；滴下：drop a handkerchief 掉了手帕； drop a purse 丢钱包；drop a letter 落了一个字母 He dropped the letter into the mailbox. 他把信投进信箱。2. 用于短语动词drop by/drop in on sb./at somewhere 顺便拜访：Will you drop in on us tomorrow evening for a talk? 你明晚顺便来和我们一起谈谈好吗? He dropped in at our school yesterday. 他昨天顺便拜访了我们学校。I'll drop by on my way home if I have time. 有空的话回家途中我会顺便来看你。drop off 1.睡着，入睡：can not drop off 不能入睡 2. (让…)下车，把…放下： I dropped him off at the post office. 在邮局处我让他下车。 I just want to drop this letter off. 我正好想要投信。 3.下降，减少：Sales have been dropping off badly. 销售额一个劲往下掉。 drop out 退出，退学： drop out of school 退学 Ten runners started, but three soon dropped out.起跑时共十个运动员，但一会儿三个就退出了。