loco

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in loco parentis

Responsible for a child's well-being while his or her parents are absent. Does being a teacher ever make you nervous, having to be in loco parentis to so many young kids?
See also: loco

plumb loco

Rur. completely crazy. (Loco is from a Spanish word meaning "mad.") You're plumb loco if you think I'll go along with that. All those people were running around like they were plumb loco.
See also: loco, plumb

loco

(ˈloko)
mod. crazy. (From Spanish.) Who is that loco kid jumping up and down in the front seat?

plumb loco

(ˈpləm ˈloko)
mod. completely crazy. (Folksy. Loco is from a Spanish word meaning “mad.”) You’re plumb loco if you think I’ll go along with that.
See also: loco, plumb