Part of Speech: Noun (in music)
While "subdominant" primarily has a musical meaning, in a more general context, it can refer to something that is not the most important but still has a significant role. For example, in a social setting, a subdominant role might refer to someone who is important but does not take the lead.
There are no common idioms or phrasal verbs specifically associated with "subdominant," as it is a specialized term primarily used in music theory.
The term "subdominant" is important for understanding musical scales and their structure.