What is another word for be instrumental?
Pronunciation: [biː ˌɪnstɹəmˈɛntə͡l] (IPA) 
To "be instrumental" means to have a significant role in bringing about a certain outcome. There are various synonyms which can be used to replace this expression, such as "to play a key role," "to be pivotal," "to be crucial," "to be essential," "to be decisive," or "to be influential." These words all indicate that the person or thing in question has had a significant impact or influence on a particular situation, outcome, or decision. Depending on the context, one synonym may be more appropriate than another; nonetheless, all of these words convey the idea of being central to the success or failure of a certain endeavor.
