A "strong challenger" refers to someone or something that poses a significant and formidable competition or threat to others.
Sentences with «strong challenger»
Stories of these tournaments have spread across the land, leading to a surge of strong challengers and beasts ready to fight! (old-games.com)
State Sen. Adriano Espaillat is widely considered to be Rangel's strongest challenger in a newly redrawn 13th Congressional district, which has a Hispanic majority for the first time. (dnainfo.com)
Republican State Party Chair Ed Cox just blasted out a copy of this letter to the editor of the Syracuse Post Standard entitled, «State GOP seeks strong challenger for Gillibrand». (nystateofpolitics.com)