guy 1 
(gī)
(gī)n.
A rope, cord, or cable used to steady, guide, or secure something.
tr.v. guyed, guy·ing, guys
To steady, guide, or secure with a rope, cord, or cable.
[Partly from Middle English gie, guide, guy (from Old French guie, from guier, to guide; see weid- in the Appendix of Indo-European roots) and partly from Low German; akin to Dutch gei, brail.]