have a bee in one's bonnet

Meaning: To be obsessed with one idea.

Language: English

Literally: (Already vivid in English)

Example: “Dad has a bee in his bonnet about solar panels.”

Category: Animals

Origin: A bee trapped under a hat would buzz relentlessly, which is what the idea does inside the head. An earlier form, "to have bees in one's head," is recorded in the 16th century; the bonnet appears in the 18th.

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