"shake on it" meaning in English

{
  "etymology_text": "Refers to the use of a handshake to confirm an agreement.",
  "forms": [
    {
      "form": "shakes on it",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "shaking on it",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "shook on it",
      "tags": [
        "past"
      ]
    },
    {
      "form": "shaken on it",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "shake<,,shook,shaken> on it"
      },
      "expansion": "shake on it (third-person singular simple present shakes on it, present participle shaking on it, simple past shook on it, past participle shaken on it)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "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 phrasal verbs formed with \"on\"",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with placeholder \"it\"",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "I'll bring the contract tomorrow, and if everything looks good, we'll shake on it.",
          "type": "example"
        },
        {
          "text": "Let's shake on it!",
          "type": "example"
        },
        {
          "ref": "1896, Clifton Johnson, “Odds”, in What They Say in New England (non-fiction), Boston, Massachusetts, United States: Lee and Shepard Publishers, page 63:",
          "text": "Often when two persons make a bargain they at its conclusion “Shake hands on it” to make it binding.",
          "type": "quote"
        }
      ],
      "glosses": [
        "To agree by shaking hands; to close a deal."
      ],
      "id": "en-shake_on_it-en-verb-EHqWWK0G",
      "links": [
        [
          "agree",
          "agree"
        ],
        [
          "shaking hands",
          "shake hands"
        ],
        [
          "close",
          "close"
        ],
        [
          "deal",
          "deal"
        ]
      ],
      "raw_glosses": [
        "(informal) To agree by shaking hands; to close a deal."
      ],
      "related": [
        {
          "word": "gentleman's agreement"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "shake on it"
}

{
  "etymology_text": "Refers to the use of a handshake to confirm an agreement.",
  "forms": [
    {
      "form": "shakes on it",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "shaking on it",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "shook on it",
      "tags": [
        "past"
      ]
    },
    {
      "form": "shaken on it",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "shake<,,shook,shaken> on it"
      },
      "expansion": "shake on it (third-person singular simple present shakes on it, present participle shaking on it, simple past shook on it, past participle shaken on it)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "gentleman's agreement"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English phrasal verbs",
        "English phrasal verbs formed with \"on\"",
        "English terms with placeholder \"it\"",
        "English terms with quotations",
        "English terms with usage examples",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "I'll bring the contract tomorrow, and if everything looks good, we'll shake on it.",
          "type": "example"
        },
        {
          "text": "Let's shake on it!",
          "type": "example"
        },
        {
          "ref": "1896, Clifton Johnson, “Odds”, in What They Say in New England (non-fiction), Boston, Massachusetts, United States: Lee and Shepard Publishers, page 63:",
          "text": "Often when two persons make a bargain they at its conclusion “Shake hands on it” to make it binding.",
          "type": "quote"
        }
      ],
      "glosses": [
        "To agree by shaking hands; to close a deal."
      ],
      "links": [
        [
          "agree",
          "agree"
        ],
        [
          "shaking hands",
          "shake hands"
        ],
        [
          "close",
          "close"
        ],
        [
          "deal",
          "deal"
        ]
      ],
      "raw_glosses": [
        "(informal) To agree by shaking hands; to close a deal."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "shake on it"
}