1. a public criticism or challenge directed at a person or organization, typically on social media or in public discourse
Usage: informal; modern usage
2. a text label or annotation that points to or highlights a specific part of an image, diagram, or document
Usage: technical; design/publishing
3. a request for someone to come to work or be on duty, especially in an emergency
Usage: occupational

Examples

• The social media callout sparked a heated debate about the company's practices.
• She received a callout at midnight to respond to the emergency.
• The diagram uses callouts to identify each component of the engine.
• His callout of the unfair policy drew support from many colleagues.
• The design team added callouts to explain the key features of the interface.
• The hospital staff responded quickly to the emergency callout.
• The influencer faced a callout for making misleading claims in her advertisement.