do (one's) damndest

To put forth the maximum amount of energy or effort toward some task or goal. Money is a little tight at the moment, but I'll do my damndest to be there for your wedding. I'm doing my damndest to get a passing grade in this class. I did my damndest to try and fix it, but this old engine is beyond repair, man.

do (one's) damnedest

To put forth the maximum amount of energy or effort toward some task or goal. Money is a little tight at the moment, but I'll do my damnedest to be there for your wedding. I'm doing my damnedest to get a passing grade in this class. I did my damnedest to try and fix it, but this old engine is beyond repair, man.

try (one's) damnedest

To put forth the maximum amount of energy or effort toward some task or goal. Money is a little tight at the moment, but I'll try my damnedest to be there for your wedding! I'm trying my damnedest to get a passing grade in this class.