Definition

Noun: A line that marks a limit or edge; a dividing line. Specifically, it refers to a physical or conceptual line that indicates the point where one area ends and another begins.

Usage

The term "boundary line" is used to denote a clear demarcation or border. It is often employed in contexts involving geography, property, sports, and abstract concepts to indicate separation or a limit.

Examples

• The white chalk on the grass served as the boundary line between the two properties.
• In baseball, the foul boundary line determines whether a hit ball is in play.
• The treaty established a new boundary line between the two nations.
• There is a clear boundary line between professional and personal conduct in this company.

Advanced Usage

• "to cross a boundary line": To go beyond an accepted limit, often in a social or ethical context.
  • His comments during the debate crossed a boundary line of civility.
• "to blur the boundary lines": To make distinctions less clear or definite.
  • Modern technology often blurs the boundary lines between work and home life.

Variants and Related Words

• Boundary (n): The general term for a line that marks the limits of an area. ("The river forms the natural boundary.")
• Border (n): Often used synonymously with boundary, especially for political divisions. ("They crossed the border into Canada.")
• Demarcation line (n): A more formal term for a boundary line, especially one established by agreement. ("The armistice agreement specified a demarcation line.")

Synonyms

• Border
• Dividing line
• Limit
• Perimeter
• Frontier

Related Phrases

• Line in the sand: An idiom meaning a figurative boundary that one will not cross or allow others to cross.
  • The new policy draws a line in the sand regarding data privacy.
• Out of bounds: A phrase (often used in sports) meaning outside the designated boundary or limits.
  • The ball landed out of bounds, so the other team gained possession.

Noun

1. a line that indicates a boundary