primarying

Noun

US uncountable

(US, politics) Mounting a challenge to an incumbent office-holder in a party primary.

Japanese Meaning

政党予備選挙において現職の候補者に挑戦する行為

Her primarying of the long-serving incumbent galvanized younger voters but split the party.

彼女の党の予備選で長年務めた現職に挑戦する決断は若い有権者を奮い立たせたが、党を分裂させた。

Sense（1）

(US, politics) Mounting a challenge to an incumbent office-holder in a party primary.