Definition

1. Noun:
   • A yellow-flowered iris plant: A specific type of iris plant (Iris pseudacorus) that has yellow flowers, native to Europe and North Africa but also found in other regions like the United States.
   • A yellow-colored flag: A flag that is yellow in color, used in various contexts to signal caution, quarantine, or a specific rule.

Examples of Usage

• Noun (Plant):
  • The pond's edge was lined with the bright blooms of the yellow flag.
  • Yellow flag is an invasive species in some wetland areas.
• Noun (Flag):
  • The ship raised a yellow flag to indicate it carried contagious disease.
  • In motor racing, a waved yellow flag signals danger ahead and prohibits passing.

Advanced Usage

• "to show the yellow flag": To issue a warning or indicate a problem.
  • The inspector showed the yellow flag when he found violations at the facility.

Variants and Related Words

• Yellow-flag iris: Another name for the plant.
• Quarantine flag: A synonym for the yellow flag used in maritime contexts to request pratique (health clearance).

Synonyms

• Caution flag: A flag (often yellow) signaling caution, especially in racing.
• Iris pseudacorus: The botanical name for the yellow flag plant.

Related Phrases

• Yellow flag protocol: The set of procedures followed when a yellow flag is displayed.
  • All drivers must observe the yellow flag protocol.

Related Idioms

• To be under a yellow flag: To be in a state of quarantine, caution, or temporary restriction.
  • The entire port was under a yellow flag for a week due to the outbreak.

Noun

1. common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated