under the radar

The phrase "under the radar" usually refers to something or someone that goes unnoticed, undetected, or receives little attention or recognition. It originates from the idea of an object or aircraft flying at a low altitude below the range of radar detection, signifying that it is intentionally trying to avoid being detected or tracked. The phrase is often used metaphorically to describe activities, behaviors, or individuals that operate discreetly, off the mainstream radar or public attention.