for the life of

for the life of you

to any degree at all She couldn't pronounce it for the life of her. For the life of me, I can't figure out why somebody would want to spend so much time watching TV.
Usage notes: usually used to emphasize negative statements, as in the examples
See also: life, of

for the life of (one)

Though trying hard: For the life of me I couldn't remember his name.
See also: life, of
References in periodicals archive ?
The amount of premium you pay goes into the policy design, especially on a traditional policy because you know you have a fixed premium often for the life of the contract.