'Matter of course' is a phrase that indicates something happening as expected or customary. Some synonyms for this phrase include 'routine,' 'usual,' 'commonplace,' 'expected,' 'normal,' 'natural,' and 'standard.' These synonyms convey the same idea that something is happening in a particular way because it is generally accepted or normal in a given situation. The use of these synonyms can help to add variety and nuance to writing and speaking, giving individuals the ability to convey their message more effectively. Whether in professional or personal communication, there are many synonyms for 'matter of course' that can be used to express oneself more clearly and effectively.