"τα σιγανά ποτάμια να φοβάσαι" meaning in Greek

{
  "forms": [
    {
      "form": "ta siganá potámia na fovásai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proverb",
        "head": "τα σιγανά ποτάμια να φοβάσαι"
      },
      "expansion": "τα σιγανά ποτάμια να φοβάσαι • (ta siganá potámia na fovásai)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "proverb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Greek proverbs",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "still waters run deep (literally: \"beware of gentle rivers\")"
      ],
      "id": "en-τα_σιγανά_ποτάμια_να_φοβάσαι-el-proverb-QDDgq0Ff",
      "links": [
        [
          "still waters run deep",
          "still waters run deep"
        ]
      ]
    }
  ],
  "word": "τα σιγανά ποτάμια να φοβάσαι"
}

{
  "forms": [
    {
      "form": "ta siganá potámia na fovásai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "proverb",
        "head": "τα σιγανά ποτάμια να φοβάσαι"
      },
      "expansion": "τα σιγανά ποτάμια να φοβάσαι • (ta siganá potámia na fovásai)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "proverb",
  "senses": [
    {
      "categories": [
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek multiword terms",
        "Greek proverbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "still waters run deep (literally: \"beware of gentle rivers\")"
      ],
      "links": [
        [
          "still waters run deep",
          "still waters run deep"
        ]
      ]
    }
  ],
  "word": "τα σιγανά ποτάμια να φοβάσαι"
}