Grammar fix
crack
solve a hard problem
To finally solve a difficult problem, puzzle, code, or mystery.
How oftenCommon
LevelB2
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
The detectives finally cracked the case after finding a new witness.
I enjoy escape rooms because it feels great when you finally crack a puzzle that has been confusing you for ages.
Fix the pattern
One small grammar move makes it sound right.
Not: I cracked down the puzzle.
Say: I cracked the puzzle.
In this meaning, 'crack' takes the object directly; 'crack down on' means take strong action against something.
Don't confuse it
Other ways to say it
Find the answer by thinking
How specificGeneralDifficult problems
figure outCommon everywhere; the usual choice in American English.work outVery common, especially British; also for sums and calculations.
crackYou're here · Finally solve a difficult problem, puzzle, or mystery.