middle finger
US /ˈmɪd.əl ˈfɪŋ.ɡər/
UK /ˈmɪd.əl ˈfɪŋ.ɡər/

1.
the finger between the forefinger and the ring finger
:
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He wears a ring on his middle finger.
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She pointed with her middle finger.
2.
an obscene gesture made by extending the middle finger upwards as a sign of contempt or defiance
:
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He gave the driver the middle finger after being cut off.
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Showing the middle finger is considered rude in many cultures.