strengthen in Bulgarian
strengthen in Bulgarian
уси́лвам
(transitive) To make strong or stronger; to add strength to; to increase the strength of; to fortify.
усилвам се
(transitive) To make strong or stronger; to add strength to; to increase the strength of; to fortify.
засилвам
(transitive) To empower; to give moral strength to; to encourage; to enhearten.