A guyline is a rope or cable that is affixed to the ground under tension in order to hold up and add stability to a structure such as a tent, mast or pole. Guyline is sometimes spelled with a hyphen, guy-line, or as two words, guy line. Synonyms are guywire, guy-wire, guy wire, guyrope, guy-rope, guy rope, or simply, guy. Guy comes from the Old French word guie, meaning a guide.
A guideline is a rule or standard by which one chooses a course of action or makes a judgement. The word guideline comes into the English language in 1785, to mean a line marked on a surface before cutting. Its use in a figurative sense doesn’t come about until 1948.
To this day, it is still not clear that proper guyline foundations were ever repoured. (The Pensacola News-Journal)
The very nicely appointed shower just a few steps from the door of the tent may be his crowning masterpiece, but there are also the combat-grade tarpaulin that protects the entire canvas wall tent, the state-of-the-art wood stove that replaced the leaky, folding pack stove we used to depend on for warmth, the wood rack that doubles as a platform to hold a five-gallon water jug, and, oh yes, the prayer flags that flutter on the guy line above the front flap, visible from the road a quarter mile away. (The Missoulian)
An investigation showed King’s truck was headed southbound when it left the road, struck a culvert, went airborne, hit a guy wire and overturned. (The Peoria Journal Star)
This guideline is based in part on evidence from clinical trials released since 2013 that suggest earlier initiation of ART among patients with HIV improves survival, reduces morbidity, and lowers the risk of transmitting the virus to uninfected individuals. (The JOurnal of the American Medical Association)