"much less" meaning in English

{
  "etymology_text": ": much less < → δείτε τις λέξεις much και less",
  "forms": [
    {
      "form": "much less"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "conj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ιδιωματισμοί (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He cannot walk yet, much less run.",
          "translation": "Δεν μπορεί να περπατήσει ακόμα, πολύ περισσότερο δε να τρέξει."
        },
        {
          "text": "He cannot run 100 yards, much less a mile.",
          "translation": "Δεν μπορεί να τρέξει εκατό γιάρδες, πόσο μάλλον ένα μίλι."
        }
      ],
      "glosses": [
        "πολύ περισσότερο δε, πόσο μάλλον"
      ],
      "id": "el-much_less-en-conj-N2xwJmI8",
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "let alone"
    }
  ],
  "word": "much less"
}

{
  "etymology_text": ": much less < → δείτε τις λέξεις much και less",
  "forms": [
    {
      "form": "much less"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "conj",
  "senses": [
    {
      "categories": [
        "Ιδιωματισμοί (αγγλικά)"
      ],
      "examples": [
        {
          "text": "He cannot walk yet, much less run.",
          "translation": "Δεν μπορεί να περπατήσει ακόμα, πολύ περισσότερο δε να τρέξει."
        },
        {
          "text": "He cannot run 100 yards, much less a mile.",
          "translation": "Δεν μπορεί να τρέξει εκατό γιάρδες, πόσο μάλλον ένα μίλι."
        }
      ],
      "glosses": [
        "πολύ περισσότερο δε, πόσο μάλλον"
      ],
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "let alone"
    }
  ],
  "word": "much less"
}