"not a patch on" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions prépositives en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "prep",
  "pos_title": "Locution prépositive",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Métaphores en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Jonathan Aitken, « How Maggie was dumped by a dashing aristocrat - because his mother said she was too common: Starting today, the most intimate biography of Thatcher you'll ever read », Daily Mail, 7 octobre 2013, mis à jour le 10 octobre 2013",
          "text": "Grantham’s snobbiness was not a patch on snooty Oxford — described in those days as a university of 7,000 experts on class. (point ajouté)",
          "translation": "Le snobisme de Grantham n’arrivait pas à la cheville de la prétentieuse Oxford — décrite à l’époque comme une université de 7 000 experts en classe [sociale]."
        }
      ],
      "glosses": [
        "Pas à la cheville de."
      ],
      "id": "fr-not_a_patch_on-en-prep-oy8rVFdp",
      "tags": [
        "figuratively"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\nɒt ə pætʃ ɒn\\"
    }
  ],
  "word": "not a patch on"
}

{
  "categories": [
    "Locutions prépositives en anglais",
    "anglais"
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "prep",
  "pos_title": "Locution prépositive",
  "senses": [
    {
      "categories": [
        "Métaphores en anglais"
      ],
      "examples": [
        {
          "ref": "Jonathan Aitken, « How Maggie was dumped by a dashing aristocrat - because his mother said she was too common: Starting today, the most intimate biography of Thatcher you'll ever read », Daily Mail, 7 octobre 2013, mis à jour le 10 octobre 2013",
          "text": "Grantham’s snobbiness was not a patch on snooty Oxford — described in those days as a university of 7,000 experts on class. (point ajouté)",
          "translation": "Le snobisme de Grantham n’arrivait pas à la cheville de la prétentieuse Oxford — décrite à l’époque comme une université de 7 000 experts en classe [sociale]."
        }
      ],
      "glosses": [
        "Pas à la cheville de."
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\nɒt ə pætʃ ɒn\\"
    }
  ],
  "word": "not a patch on"
}