"A close one" is a common phrase that describes a near miss or a narrow escape from danger or trouble. There are several synonyms for this phrase that can be used interchangeably to convey the same meaning. "Near miss" refers to a situation in which something almost went wrong but didn't. "Narrow escape" suggests that someone managed to avoid danger or harm in a situation that could have been much worse. "Close call" is a phrase that is often used to describe a situation where only luck or a split-second decision saved someone from harm. "Hair-raising" is another synonym that implies a situation that was frightening or intense but ultimately ended without serious consequences.