"keen as a bean" meaning in English

{
  "etymology_text": "Chosen for the rhyme.",
  "head_templates": [
    {
      "args": {
        "1": "-",
        "head": "(as) keen as a bean"
      },
      "expansion": "(as) keen as a bean (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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 similes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "2018 Alasdair Duncan, Here’s How To Improve Your Pitiful Uber Rating From Someone Who Did It Pedestrian, 17 September 2018. Accessed 4 May 2019.\nOn my afternoon trip home, I struck a driver who seemed keen as a bean to get me to mash that five star rating – his Mitsubishi Outlander was stocked with mints and bottled water and he offered them all to me and even asked if I wanted to make any extra stops on the way home."
        }
      ],
      "glosses": [
        "Very keen; enthusiastic; eager."
      ],
      "id": "en-keen_as_a_bean-en-adj-X9NLEbF7",
      "links": [
        [
          "keen",
          "keen"
        ],
        [
          "enthusiastic",
          "enthusiastic"
        ],
        [
          "eager",
          "eager"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, informal) Very keen; enthusiastic; eager."
      ],
      "tags": [
        "informal",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-keen as a bean.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6f/En-au-keen_as_a_bean.ogg/En-au-keen_as_a_bean.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/6/6f/En-au-keen_as_a_bean.ogg"
    }
  ],
  "word": "keen as a bean"
}

{
  "etymology_text": "Chosen for the rhyme.",
  "head_templates": [
    {
      "args": {
        "1": "-",
        "head": "(as) keen as a bean"
      },
      "expansion": "(as) keen as a bean (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English rhyming phrases",
        "English similes",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "2018 Alasdair Duncan, Here’s How To Improve Your Pitiful Uber Rating From Someone Who Did It Pedestrian, 17 September 2018. Accessed 4 May 2019.\nOn my afternoon trip home, I struck a driver who seemed keen as a bean to get me to mash that five star rating – his Mitsubishi Outlander was stocked with mints and bottled water and he offered them all to me and even asked if I wanted to make any extra stops on the way home."
        }
      ],
      "glosses": [
        "Very keen; enthusiastic; eager."
      ],
      "links": [
        [
          "keen",
          "keen"
        ],
        [
          "enthusiastic",
          "enthusiastic"
        ],
        [
          "eager",
          "eager"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, informal) Very keen; enthusiastic; eager."
      ],
      "tags": [
        "informal",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-keen as a bean.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6f/En-au-keen_as_a_bean.ogg/En-au-keen_as_a_bean.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/6/6f/En-au-keen_as_a_bean.ogg"
    }
  ],
  "word": "keen as a bean"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: as",
  "path": [
    "keen as a bean"
  ],
  "section": "English",
  "subsection": "adjective",
  "title": "keen as a bean",
  "trace": ""
}