cross-promoting

Verb

cross-promote (third-person singular simple present cross-promotes, present participle cross-promoting, simple past and past participle cross-promoted)

1. (ambitransitive) To advertise or promote products by using other advertised products, services, or promotions, thereby simultaneously increasing the commercial presence and impact for all products involved.
2. (transitive, usually, between two or more parties, entities) To promote mutually.