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le manchot

one-armed person, person missing an arm or hand, penguin

m ɑ̃ . ʃ o
noun · masculine Rare #45,417
one-armed person, person missing an arm or hand Colloquially, it can also describe someone who is clumsy or incompetent at a task.
FR: Depuis son accident, il est manchot.
EN: Since his accident, he has been missing an arm.
penguin In French, manchot refers to penguins such as emperor penguins; it is distinct from pingouin.
FR: Le manchot nage très bien.
EN: The penguin swims very well.

Ben non, en fait, il était juste manchot.

No, actually, he was just one-armed.

— Grave (2017)

C'était le manchot armé.

It was the armed penguin.

— The Mask (1994)

Quelle est la différence entre un manchot et un pingouin ?

What is the difference between a penguin and a puffin?

Tu n'es pas un manchot.

You're not a penguin.

Le mec à la clarinette, c'est pas un manchot.

That guy on the clarinet is no slouch.

— Get Out Your Handkerchiefs (1978)

Sounds similar to

manteau m ɑ̃ . t o manteaux m ɑ̃ . t o mambo m ɑ̃ . b o