throw caution to the wind
The idiom “throw caution to the wind” is a saying that means to be extremely daring or to take a huge risk.
The image of a brave person taking “caution” and fearlessly throwing it into the wind (where it is blown away) is an old one. We also use this expression to refer to the actions of a person who puts aside his or her fears to perform a brave deed.
Here is the idiom being used in a sentence:
Pablo threw caution to the wind and jumped out of the plane on his first skydiving experience.