for the life of

for the life of (one)

Despite one's best efforts; to any degree whatsoever. Often used in negative constructions. For the life of me, I can't remember where I left my keys! She coudn't understand for the life of her why people were so obsessed with celebrity gossip.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