What is the meaning of the word "flush" in the angular.js documentation?

Question

Angular

I study documentation on Angular.js. So the $http service has a flush() method. For myself translated as "perform". But for the reason that the verb is often found in the documentation, I would like to know what exactly is meant by this word.
In the dictionary: flush, rinse, blush.
Thanks

Answer 1

I met only in the meaning of "clear"

Answer 2

Reset. From buffer to disk, for example. Or, as in the case of $http, from the queue - for execution.
If you do not call flush, then the execution will begin sometime later, when the queue comes. If called, then immediately.