"bi fo" meaning in Zarma

{
  "categories": [
    {
      "kind": "other",
      "name": "Lexique en zarma du temps",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adverbiales en zarma",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Wiktionnaire:Sections de type avec locution forcée",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Zarma",
      "orig": "zarma",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "bi + fo"
  ],
  "lang": "Zarma",
  "lang_code": "dje",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "glosses": [
        "Avant-hier."
      ],
      "id": "fr-bi_fo-dje-adv-SmQ~Pf~b"
    }
  ],
  "word": "bi fo"
}

{
  "categories": [
    "Lexique en zarma du temps",
    "Locutions adverbiales en zarma",
    "Wiktionnaire:Sections de type avec locution forcée",
    "zarma"
  ],
  "etymology_texts": [
    "bi + fo"
  ],
  "lang": "Zarma",
  "lang_code": "dje",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "glosses": [
        "Avant-hier."
      ]
    }
  ],
  "word": "bi fo"
}