徹てっ頭とう徹てつ尾び

adverb

thoroughly; from beginning to end; completely

Emphasizes doing something consistently and without exception from start to finish. Often used in formal or emphatic contexts.

• 彼かれは徹てっ頭とう徹てつ尾び、自じ分ぶんの意い見けんを曲まげなかった。

  He stuck to his opinion from beginning to end.

• この計けい画かくは徹てっ頭とう徹てつ尾び、見み直なおす必ひつ要ようがある。

  This plan needs to be thoroughly re-examined.