"I'll be ready to go when it's time to go"

[*ochocincos*]

(05-28-2021, 05:14 PM)fredtoast Wrote: Guarantee | Definition of Guarantee by Merriam-Webster

Fair enough. But I would say the most common understanding and definition of the term "guarantee" is 100% certainty.
If someone said they guaranteed it was going to rain today because the forecast said 90% chance and it ends up not actually happening, would you point out that it shouldn't have been a guarantee? I would.