godan verb (-su), transitive verb
Neutral use for spending money, time, effort, or resources. Often implies intentional allocation.
彼は研究に多くの時間を費やした。
He spent a lot of time on his research.
We ended up spending most of the budget on this project.
godan verb (-su), transitive verb
Negative nuance: spending carelessly or on something worthless. Often used with 無駄に.
彼はギャンブルで全財産を費やした。
He squandered his entire fortune on gambling.
そんなことに時間を費やすのは無駄だ。
It's a waste to spend time on such things.
godan verb (-su), transitive verb
Positive nuance: giving time, effort, or life to a worthy cause or purpose. Often used with ～に一生を費やす.
彼女は教育に一生を費やした。
She devoted her life to education.
彼はこの問題の解決に全力を費やした。
He devoted all his energy to solving this problem.