guarantee
"Guarantee" is a very useful word in everyday English. It works as both a noun and a verb, and it has a few closely related meanings that all share the same core idea: making a firm, confident promise that something will happen or is true.
You can also use 'guarantee' to say that one thing makes another thing certain to happen — not a personal promise, but a cause-and-effect certainty. This is often used in a slightly figurative way.
everyday language · Modern, widely used · figurative
Arriving late to an interview is guaranteed to make a bad impression.
Practicing every day does not guarantee perfection, but it helps enormously.