How would you define grit?

I'm beginning a piece about "grit" for the upcoming season by sifting through numbers that ideally best reflect what the hell grit is, or at least a working definition as a jumping off point. Before I went further, I wanted to get your take: what do you define generally as hockey grit? More specifically, what stats - like hits, blocked shots, penalty +/-, etc - closely correlate with what you expect from an efficient checking line?

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