Subject to or undergo extreme pressure or strain, as from working. For example, I badly need a vacation; I'm just plain stressed out from this job and its aggravations. The verb stress has meant “afflict with hardship” or “distress” since the 16th century, but the phrase stress out, alluding to psychological stress, dates only from the 1940s
subject to an extreme amount of stress or strain; experience an overwhelming amount of stress or strain, become overwhelmed by anxiety or worry