double agent

person who spies for two rival countries at the same time 双重间谍.

dorsal, dory, DOS, dosage, dose, doss, doss-house, dosser, dossier, dot, dot matrix, dotage, dote, doting, dotingly, dotted line, dottiness, dottle, dotty, double, double back, double bed, double bill, double bind, double bluff, double chin, double cream, double date, double Dutch, double entendre, double entry, double figures, double first, double pneumonia, double standard, double take, double time, double transitive verb, double up, double-barrelled,