万ばん全ぜんを期きす

expression, godan verb (-su)

make absolutely sure; take every precaution; leave nothing to chance

Used when thorough preparation or exhaustive measures are taken to ensure success or safety. Often appears in formal or business contexts.

• 試し験けんに合ごう格かくできるよう、万ばん全ぜんを期きして準じゅん備びした。

  I prepared thoroughly, leaving nothing to chance, so that I could pass the exam.

• プロジェクトの成せい功こうのため、万ばん全ぜんを期きす必ひつ要ようがある。

  We must take every possible measure to ensure the project's success.