

給料の半分を服に費やしてしまいました。
買い物に一日中時間を費やすのはもったいないです。
先月はゲームにいくら費やしたの?
"ついやす(費やす)" is in the lesson "Shopping" (Level 34), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.