remaining strength; reserve power; surplus energy
Refers to physical, mental, or organizational capacity left after some effort or task. Often used in contexts like 余力がある (have reserves) or 余力を残す (conserve strength).
まだ余力があるので、もう少し走れます。
I still have some reserve strength, so I can run a bit more.
I still have some energy left, so I can run a bit more.
試験勉強に余力を残さず全力を尽くした。
I gave it my all for exam prep without conserving any energy.
money to spare; financial leeway
Used when one has extra funds beyond what is needed. Common in expressions like 余力があれば (if there is money to spare).
今月は余力がないので、外食は控えよう。
I have no money to spare this month, so let's cut back on eating out.
マラソンの後半のために余力を残しておいた。
I kept some strength in reserve for the second half of the marathon.
After hours of work, I'm running out of reserve energy.
If we have some money to spare, I'd like to buy new equipment.