The term "hirundo pyrrhonota" refers to a specific type of bird known as the cliff swallow. Let's break it down for easier understanding.
There are no specific idioms or phrasal verbs directly related to "hirundo pyrrhonota." However, the word "swallow" can be used in idioms related to the act of swallowing, such as "to swallow one's pride," which means to accept something difficult or humiliating.