Also means
crab louse
Usage Note
morpion has two very different meanings: the classic pencil-and-paper game noughts and crosses (tic-tac-toe in North American French) and, in a vulgar register, a pubic louse (pou du pubis). Context always makes the intended meaning clear. The game sense is perfectly acceptable in everyday speech.
Examples
"On joue au morpion pendant la récré."
Natural Translation
We play noughts and crosses during break.

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