Comparative form of gutsy; more courageous, bold, or daring than something or someone else.
From 'gutsy' (having courage/guts) plus the comparative suffix '-er.' Part of the 'guts' word family tracing back to Old English concepts of bravery residing in the belly.
The fact that English even has 'gutsy,' 'gutsier,' and 'gutsiest' shows how deeply we believe bravery comes from the gut—we literally ranked courage on a scale, making 'guts' a quantifiable virtue.
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