In a single-strand chain,messages move through the grapevine by one person telling a rumor to the next,who then tells the next person,who tells the next and so on.

Single-strand Chain

A series of connected entities or elements that follow one after the other in a single line or sequence.

Grapevine

An informal channel of communication within an organization, relying on social networks rather than official routes of communication.

Rumor

An unverified piece of information, story, or report of uncertain origin that spreads from person to person, often fueled by speculation.