"jste" meaning in Czech

{
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    [
      "jste",
      "jste#Old_Czech"
    ]
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        "2": ":inh",
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        "text": "2",
        "tree": "1"
      },
      "expansion": "[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Czech\", \"term\" : \"jste\", \"status\" : \"ok\", \"lang\" : \"cs\" }\" data-lang=\"cs\" data-title=\"jste\">\nInherited from Old Czech jste.",
      "name": "ety"
    },
    {
      "args": {
        "1": "cs",
        "2": ":inh",
        "3": "zlw-ocs:jste",
        "text": "2",
        "tree": "1"
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      "expansion": "Etymology tree\nProto-Slavic *este\nOld Czech jste\nCzech jste\nInherited from Old Czech jste, from Proto-Slavic *este.",
      "name": "ety"
    }
  ],
  "etymology_text": "Inherited from Old Czech jste.",
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        "2": "verb form"
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      "name": "head"
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  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech entries with etymology texts",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Czech entries with etymology trees",
          "parents": [],
          "source": "w"
        },
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          "parents": [],
          "source": "w"
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        },
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          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "být"
        }
      ],
      "glosses": [
        "second-person plural present indicative of být"
      ],
      "id": "en-jste-cs-verb-pDYpyOyH",
      "links": [
        [
          "být",
          "být#Czech"
        ]
      ],
      "tags": [
        "form-of",
        "indicative",
        "plural",
        "present",
        "second-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈ(‿j)stɛ]"
    }
  ],
  "word": "jste"
}

{
  "etymology_links": [
    [
      "jste",
      "jste#Old_Czech"
    ]
  ],
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        "Czech terms derived from Old Czech",
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        "Czech terms inherited from Old Czech",
        "Czech terms inherited from Proto-Slavic",
        "Czech terms with IPA pronunciation",
        "Czech verb forms",
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      ],
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          "být",
          "být#Czech"
        ]
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        "second-person"
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  ],
  "sounds": [
    {
      "ipa": "[ˈ(‿j)stɛ]"
    }
  ],
  "word": "jste"
}