What does the word treabling mean?

I think the Word you are looking for is tremble:

1. Shake involuntarily, typically as a result of anxiety, excitement, or frailty.

2. Be in a state of extreme apprehension: "I tremble to think that we could ever return to conditions like these".

Or TREBLE:

1. threefold; triple.

2.Music .

a. of or pertaining to the highest part in harmonized music; soprano.

b. of the highest pitch or range, as a voice part, voice, singer, or instrument.

c.high in pitch; shrill.

-noun