How to stop search boxes saving what you've searched?

you know how in google, or wikihow, wikipedia, etc anywhere you can search where you've searched before, basically - you start typing in the box and it comes down with what you've previously searched, how do I stop this? for one its annoying, and two a lot of people go on my laptop, i dont really fancy them seeing what ive searched for in the past!

I'm on a Mac and I'm running Safari.

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