on the lookout for
collocation留意；警戒
The police are on the lookout for a suspicious man.
警方正在留意一名可疑男子。
瞭望者；警戒员
lookouts — plural of lookout
瞭望台；观景台；瞭望塔；警戒；监视；放哨；景色；景象；观察对象；观点；视角；自己的责任；观察窗；瞭望孔
A person who watches for danger, an enemy, or a hoped-for event.
能看到周围区域的有利位置。
A vantage point with a view of the surrounding area.
瞭望员
a person employed to keep watch for some anticipated event
一段监视来犯敌人、警察等的时间。
A session of watching for an approaching enemy, police, etc.
瞭望台
an elevated post affording a wide view
负责警戒来犯敌人、警察、危险等的人。
A person on watch for approaching enemy, police, danger, etc.
瞭望塔
a structure commanding a wide view of its surroundings
观察的对象；景色或景观。
A subject for observation; a prospect or view.
某人的观点、看法；因而引申为某人的责任。(与所有格代词或名词所有格形式连用)
One's perspective, outlook; hence, one's responsibility. (used with a possessive pronoun or a noun in a possessive form).
观察窗
An observation window.
从建筑外墙悬臂延伸的托梁,用于支撑屋顶板材并提供钉钉面
A joist that extends in cantilever out from the exterior wall (or wall plate) of a building, supporting the roof sheathing and providing a nailing surface for the fascia boards.
The lookout spotted the approaching ship long before it reached the harbor.
瞭望员在船只抵达港口之前很久就发现了它。
用法提示：这里'lookout'作为名词，指执行瞭望任务的人。
From the lookout, we could see the entire valley spread out below us.
从瞭望台上，我们可以看到整个山谷在我们下方展开。
用法提示：这里'lookout'作为名词，指提供广阔视野的观察位置或结构。
The park built a new lookout at the top of the hill for visitors to enjoy the view.
公园在小山顶上建了一个新的观景台，供游客欣赏风景。
用法提示：这里'lookout'作为名词，指观景建筑或平台。
多指站在哨位上的士兵，带军事色彩；在普通建筑、车辆场景中不如 guard 自然。
通常指夜间看守房屋、仓库或工地的人，强调整夜值班，不强调观察远处。
最通用的“保卫者”，侧重保护安全；lookout 更强调监视四周动静，不一定是武装人员。
只强调观看或监视，不带有“警戒/防守”的含义，仅在“受命监视”的场合勉强可替换。
留意；警戒
The police are on the lookout for a suspicious man.
警方正在留意一名可疑男子。
保持警戒；注意
Please keep a lookout for any vehicles coming down the road.
请留意路上驶来的车辆。
担任瞭望员；放哨
He acted as a lookout while his friends broke in.
他朋友闯进去时，他在外面放哨。
瞭望塔
The fire lookout tower gives a wide view of the forest.
这座防火瞭望塔可以一览森林全景。
观景台
The cliff lookout point is popular with hikers.
这个悬崖观景台很受徒步者欢迎。
look（看）+ out（向外）→ 向外看的人/处；相关词：look、outlook、looker
与lookout表示的‘警戒观望’属同一语义场，指对周围持续观察。
lookout的核心动作是观察，observation为其名词形式，语义相关但不完全等同。
lookout的职责是保持警觉并发出警报，alert与这一职责紧密相关。
lookout的目的在于发现危险，danger是其关注的核心对象。
瞭望人员常用望远镜观察远处，是此语义场中的常用工具。
留心；密切注意
The police are on the lookout for a white van seen near the scene.
警方正在密切注意案发现场附近出现过的一辆白色面包车。
保持警戒；监视
You stay here and keep a lookout while I check the back door.
你待在这里保持警戒，我去检查后门。
那是你自己的事；你自己负责
If you don't study for the exam, that's your lookout.
如果你不复习考试，那是你自己的事。
发短 /ʊ/ 音 (如 good, book)
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Dictionary facts from ECDICT, WIKTIONARY.