thought really hard, tried very hard to remember something, he strained to solve some problem

The following video provides you with the correct English pronunciation of the word "racked his brains", to help you become a better English speaker.

שבר את הראש (אימץ את מוחו, הרהר עמוקות, התאמץ לפתור בעיה)

forzó el cerebro (pensó profundamente, rompió la cabeza, se esforzó en solucionar un problema)

s'est cassé la tête, a essayé de résoudre ses problèmes

si è scervellato

spremersi il cervello, sforzarsi di ricordare