English Reference
noun

lookout

n.
US /ˈɫʊˌkaʊt/ UK /lˈʊkaʊt/ look·out UK spelling lookouts

  1. 01 B2 Upper Intermediate

    a person who is responsible for watching for danger or for something approaching.

    a person stationed to keep watch for approaching danger, enemies, or specific events.

    Simple

    The bank robbers left one man outside to act as a lookout for the police.

    In context

    The ship's lookout was the first to spot the distant lights of the harbour through the thick morning fog.

    Usage

    Often used with the indefinite article 'a'.

  2. 02 B2 Upper Intermediate

    the act of watching carefully for something, often used in the phrase 'on the lookout'.

    the act or state of keeping a systematic watch for someone or something.

    Simple

    You should be on the lookout for a blue car parked near the entrance.

    In context

    Security teams remained on the lookout for any suspicious activity during the high-profile political summit.

    Usage

    Commonly appears in the idiomatic phrase 'on the lookout for'.

  3. 03 B2 Upper Intermediate

    a high place where you can see a long way, like a balcony or a hill.

    an elevated place or structure that affords a wide view of the surrounding area.

    Simple

    We stopped at a mountain lookout to take photos of the valley below.

    In context

    The coastal lookout provided the rangers with an unobstructed view of the migrating whale pods.

  4. 04 C1 Advanced British EnglishInformal

    your own problem or responsibility.

    an individual's personal concern, prospect, or responsibility.

    Simple

    If he chooses to ignore the warning, that is his lookout.

    In context

    The manager made it clear that if the staff failed to meet the deadline, it would be their own lookout during the performance review.

    Teacher's tip

    This sense is primarily British and can sound slightly dismissive or cold.

Japanese media report a lookout had signalled the workers were clear of the tracks.

Al Jazeera· 20 Aug 2026

Deverbal from look out.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated