1 [+colours, sounds, shapes] fundirse; [+roads] empalmar to merge into the background confundirse con el fondo; the bird merged into its background of leaves el pájaro se confundía mimetizaba con el fondo de hojas;or this question merges into a bigger one esta cuestión queda englobada en otra mayor
2 [+companies, organizations, parties] fusionarse to merge with another company fusionarse con otra empresa