Nahum speaks of the people losing courage as if their hearts melt like wax. Alternate translation: "Everyone loses courage" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The loins are either 1) a synecdoche for the whole person. Alternate translation: "everyone is in anguish" Or 2) a metonym for the internal organs, and you should describe them using your language's words for how a person's stomach feels when he is very frightened. Alternate translation: "everyone's stomachs are churning" (See: [[rc://en/ta/man/translate/figs-synecdoche]])