By hook or by crook
Definition 1 of 1
Pro Tip 1/3Persistence
Suggests relentless effort to achieve something, despite difficulties. 
She sought the job by hook or by crook, attending every networking event possible.
Pro Tip 2/3Possible Negativity
Can imply unethical methods, so use carefully to avoid misunderstanding. 
He acquired the rare book collection by hook or by crook, raising some eyebrows.
Pro Tip 3/3Informality
Used in casual or informal settings, less suitable for formal writing. 
I’ll figure out this puzzle by hook or by crook, even if it takes all night.