"on the lookout" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "on the lookout",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "on the lookout",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "alt": "APB",
          "word": "all-points bulletin"
        }
      ],
      "derived": [
        {
          "english": "BOLO",
          "word": "be on the lookout"
        }
      ],
      "examples": [
        {
          "text": "I'm on the lookout for a good example of a Roman dinar from the 1st century. Let me know if you hear of one anywhere."
        },
        {
          "ref": "2020, Jess Ryder, The Night Away",
          "text": "In London, of all places, where people are always on the lookout for opportunities to commit crimes: an unzipped handbag, a phone sticking out of a back pocket, an unpadlocked bike.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Constantly alert, intent on finding something or someone."
      ],
      "id": "en-on_the_lookout-en-prep_phrase-vQ2BWIOi",
      "links": [
        [
          "alert",
          "alert"
        ]
      ],
      "synonyms": [
        {
          "word": "on the outlook"
        }
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "intent on finding something",
          "word": "à l’affût"
        },
        {
          "code": "mi",
          "lang": "Maori",
          "sense": "intent on finding something",
          "word": "matakana"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "intent on finding something",
          "word": "de olho"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "intent on finding something",
          "word": "ojo avizor"
        },
        {
          "code": "tr",
          "lang": "Turkish",
          "sense": "intent on finding something",
          "word": "arayışında"
        },
        {
          "code": "tr",
          "lang": "Turkish",
          "sense": "intent on finding something",
          "word": "peşinde"
        }
      ]
    }
  ],
  "word": "on the lookout"
}

{
  "coordinate_terms": [
    {
      "alt": "APB",
      "word": "all-points bulletin"
    }
  ],
  "derived": [
    {
      "english": "BOLO",
      "word": "be on the lookout"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "on the lookout",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "on the lookout",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "text": "I'm on the lookout for a good example of a Roman dinar from the 1st century. Let me know if you hear of one anywhere."
        },
        {
          "ref": "2020, Jess Ryder, The Night Away",
          "text": "In London, of all places, where people are always on the lookout for opportunities to commit crimes: an unzipped handbag, a phone sticking out of a back pocket, an unpadlocked bike.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Constantly alert, intent on finding something or someone."
      ],
      "links": [
        [
          "alert",
          "alert"
        ]
      ],
      "synonyms": [
        {
          "word": "on the outlook"
        }
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "intent on finding something",
      "word": "à l’affût"
    },
    {
      "code": "mi",
      "lang": "Maori",
      "sense": "intent on finding something",
      "word": "matakana"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "intent on finding something",
      "word": "de olho"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "intent on finding something",
      "word": "ojo avizor"
    },
    {
      "code": "tr",
      "lang": "Turkish",
      "sense": "intent on finding something",
      "word": "arayışında"
    },
    {
      "code": "tr",
      "lang": "Turkish",
      "sense": "intent on finding something",
      "word": "peşinde"
    }
  ],
  "word": "on the lookout"
}