See below.: Burping is usually caused by swallowing a lot of air while eating or drinking. If it is associated with other symptoms, such as pain, nausea, decreased appetite or weight loss, it may be caused by reflux, anxiety, gallstones, ulcers, among others causes.
The definition of repugnant is something that is extremely offensive, contradictory or antagonistic. 1  An example of a repugnant odor is the smell of rotting milk.  An example of repugnant is someone doing something that is inconsistent with what they have said they were going to do.
Around page 197 you describe some of the reasons to care about usage. One of the reasons that resonates with me is efficiency of communication. A writer and reader who understand the meaning of repugnant can communicate using a single word where otherwise they would need several. The same applies to restrictive vs. nonrestrictive clauses, and many other aspects of grammar.