The phrase "on edge" is an idiom commonly used in English to describe someone who is tense, anxious, or nervous. When a person is "on edge," they may feel restless, agitated, or easily startled. It's as if they are at the brink of emotional discomfort or instability, as if they are balancing on the edge of a precipice, about to fall into a state of heightened sensitivity or stress.
Example: "Ever since the accident, she's been on edge and jumps at the slightest noise."
The term can also be used to describe a situation or atmosphere that is tense or uneasy, as if there is a feeling of impending unease or danger.
Example: "The city was on edge after a series of burglaries in the neighborhood."
In summary, "on edge" refers to a state of emotional or situational tension, often indicating someone's heightened sensitivity or unease.