Do (one's) darndest American informal verb phrase
Another version of this phrase is "do one's damnedest."
To do something with as much effort as one possibly can.
Don't be sad. At least you do your darndest.
Despite losing the match, Danny still kept a smile on his face knowing that he has done his darndest.
1. If you say enough bad things about someone, some of them will be believed.
2. Try many different ways or ideas, some of them will work.
To think or consider something seriously
To despise or make determined attempts less strong
Making a start on something is always difficult.
The verb "do" should be conjugated according to its tense.
A problem or difficult circumstance
I'm short-sighted, so forgetting my glasses is a real hair in the butter for my sight.