幾いく年ねんにもわたる

expression, noun-modifying (irregular)

extending over many years; spanning several years

Rare, formal expression used as a prenominal modifier to describe something that lasts or continues for a long period of years. Often found in written or literary contexts.

• 幾いく年ねんにもわたる研けん究きゅうの末すえ、ついに新しん薬やくが完かん成せいした。

  After many years of research, the new drug was finally completed.

• これは幾いく年ねんにもわたる努ど力りょくの結けっ晶しょうだ。

  This is the fruit of many years of effort.