look up look for search for

1.look up 在字典中查找；向上看.I will look up this word.我将要在字典中查找这个单词.Look up,there is a plane in the sky.向上看,天上有架飞机.2.look for 、寻找I am looking for my dog.我正在寻找我的狗.3.look over 医生给病人仔细检查身体The doctor is looking over Tony.医生在给托尼检查身体.4.search for 搜寻,查找I am searchng for some useful information on the Internet.我正在网上查找有用的信息.5.search out 找到
The lawyer searched out the weaknesses in the witness's statement.
律师找出了证人供词中的漏洞.