arrovellarsi significa in inglese

brood [brooded, brooding, broods]▼(to dwell upon moodily and at length)
verb
[UK: bruːd] [US: ˈbruːd]

rack one's brain▼(struggle to think of something)
verb
[UK: ræk wʌnz breɪn] [US: ˈræk wʌnz ˈbreɪn]