Barks signal danger.
Meaning: This means that when a dog makes a barking sound, it is often communicating or conveying a message that there is a situation or thing that is likely to cause harm or injury.
Choice of Words: Barks is a verb that refers to the sound that dogs make when they are alerting others to something. Signal is a noun that means to communicate or convey a message. Danger is a noun that refers to a situation or thing that is likely to cause harm or injury.
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