have the guts
Possess the courage, as in Does he have the guts to dive off the high board? This expression replaces the earlier and now obsolete sense of stomach as "courage," a usage from the early 1500s. [Slang; late 1800s]
|a chattering or flighty, light-headed person.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
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