One suggestion for a name for a solution is from this great article is directional menu aiming.
It shows how Amazon prevent users from incorrectly selecting an unwanted element while hovering their ‘mega-menu’, without using delays, through detecting the path of the cursor.
At every position of the cursor you can picture a triangle between the current mouse position and the upper and lower right corners of the dropdown menu. If the next mouse position is within that triangle, the user is probably moving their cursor into the currently displayed submenu. Amazon uses this for a nice effect. As long as the cursor stays within that blue triangle the current submenu will stay open.
The issue you’re talking about is sometimes referred to as a “narrow mouse corridor”. Having a narrow mouse corridor can result in users becoming frustrated by the lack of user control.
An alternative to Amazon’s triangle approach (which was originally done by Bruze Tognazzini in 1986 with Apple) is to use little boxes to extend the corridor. One advantage of this particular implementation is that it’s pure CSS (pseudo-elements) so it removes the dependency on jQuery (or vanilla JS).
(Image from: https://css-tricks.com/dropdown-menus-with-more-forgiving-mouse-movement-paths/)
Where I work, we call that a “death-star trench menu”.
I”m pretty sure we didn’t invent that name, but I can’t find the book it’s from.