The word "auxiliary" can be used as both an adjective and a noun, and it generally means something that provides extra support or assistance.
Definition: When "auxiliary" is used as an adjective, it describes something that helps or adds support to something else.
In more advanced contexts, "auxiliary" can describe systems or functions that are not the main ones but still play an important role. For example, in engineering, an "auxiliary pump" helps maintain flow when the main pump is not enough.
While "auxiliary" doesn’t have specific idioms or phrasal verbs, you might encounter phrases like: - "Auxiliary functions" (used in technical contexts to describe supportive operations).
In summary, "auxiliary" is a helpful word that indicates support or assistance, whether it’s describing staff in a workplace, systems in engineering, or verbs in grammar.