What does “Yeah” mean

An "abyss" is a very deep hole or pit. So "falling into an abyss" literally means falling down a very deep hole. Figuratively, then, it can mean getting into some problem that you can't get out of. The idea of falling and falling and never reaching the bottom can also be frightening, so the phrase can be used to mean something scary.

"Have a good cry" means to spend time crying. It's usually used to describe someone who has just had some very bad or sad experience, and goes off by herself (usually but not always used in reference to a woman) somewhere to just sit and cry about it and get the bad feelings out of her system. Like, "When my boyfriend dumped me, I went home and had a good cry."

Joe Dark is correct to say that when all men wore hats, it was polite to tip (remove the hat briefly) to show respect to someone.

The phrase tip one's hat is now an idiom and simply means to show someone respect, often in recognition of an achievement (but does not involve an actual hat). An example:

I'm impressed by your use of English. I tip my hat to you.

The phrase tip the hat as used in the film isn't an idiom, as it is not well established. It is a metaphor.

In this case the hat being tipped is a helicopter.

Bascially, tip the hat in this context means the helicopter is being tilted at an extreme angle.