the.com/mother hen

Someone who turns ordinary care into a full-time surveillance operation.

means A person who watches over others with anxious, fussy, overprotective attentiveness, often more than is wanted or needed.

from Drawn straight from the barnyard: a hen with chicks will puff up, cluck, and bustle anyone away who gets too close to her brood, treating every shadow as a hawk. The literal image — feathers raised, eye on every chick — got lifted into human use for anyone (parent, boss, friend) who hovers and frets over their 'brood' with that same instinctive, bristling vigilance. The phrase has stayed close to its farmyard root rather than drifting into obscurity, which is part of why it still lands so vividly.

origin
literal hens guarding chicks from predators
first human use
recorded by the 1840s in print
tell
worries loudest about people who never asked
irony
the fussing often outlasts any actual danger
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