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1. A challenge to a fight or duel

1. Utter aloud; often with surprise, horror, or joy
   "'I won!' he called out"
   - exclaim, cry, cry out, outcry, shout
    
2. Call out loudly, as of names or numbers
    
3. Challenge to a duel
   "Aaron Burr called out Alexander Hamilton"

Derived forms: calls out, calling out, call-outs, called out

See also: call

Type of: announce, challenge, denote, express, give tongue to, utter, verbalise [Brit], verbalize