In order to save the company, the CEO had to swallow his pride and ask for a loan from his rival.

swallow 本义是"吞咽"，在这里用作比喻，表示"忍受、接受"。 his 是代词 he 的所有格形式，指代"他的"。 pride 的意思是"骄傲、自尊心"。 swallow one's pride 是一个固定短语，字面意思是"吞下某人的骄傲"，实际含义是"放下自尊、忍辱"。