You get one chance to be in charge of this game and don't want to make a crucial mistake like a penalty or disallowed goal.
Times, Sunday Times
It was a crucial mistake.
Times, Sunday Times
Some now believe that was a crucial mistake.
Times, Sunday Times
His crucial mistake was hanging around long enough to fashion an actual legacy.
Globe and Mail
He made a crucial mistake three from home last time and looks to be nicely treated.
The Sun