Jisho

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Auxiliary, 'ku' adjective (archaic)
1. must; should; ought to​Formal or literary term, Usually written using kana alone, See also べき
  • かく各
  • かいいん会員
  • は
  • かいひ会費
  • を
  • はら払う
  • べし
  • 。
Each member has to pay a membership fee.
Auxiliary adjective, 'ku' adjective (archaic)
2. will (surely); be bound to; must​Formal or literary term, Usually written using kana alone
Auxiliary, 'ku' adjective (archaic)
3. will (do); shall​Formal or literary term, Usually written using kana alone, indicates volition
Notes
可し: Rarely-used kanji form.

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