yellow-flag

noun

/ˈjɛl.oʊ.flæɡ/

A yellow flag is a signal used to indicate caution, typically in various contexts such as sports, maritime activities, or health situations.

1. During the race, the yellow flag was waved to alert drivers of a nearby accident.

2. The lifeguard raised a yellow flag when the waves became dangerous for swimming.

In general, it signifies a warning or the need to be cautious, often related to potential hazards.