"phase in" meaning in Anglais

{
  "antonyms": [
    {
      "word": "phase out"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions verbales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Verbes à particule en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de cf, phase et in."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "verb",
  "pos_title": "Locution verbale",
  "senses": [
    {
      "glosses": [
        "Introduire progressivement, par phases."
      ],
      "id": "fr-phase_in-en-verb-o69AiQut"
    }
  ],
  "word": "phase in"
}

{
  "antonyms": [
    {
      "word": "phase out"
    }
  ],
  "categories": [
    "Compositions en anglais",
    "Locutions verbales en anglais",
    "Verbes à particule en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Composé de cf, phase et in."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "verb",
  "pos_title": "Locution verbale",
  "senses": [
    {
      "glosses": [
        "Introduire progressivement, par phases."
      ]
    }
  ],
  "word": "phase in"
}