Trembling is a common physical indicator of so many, mainly negative emotions – anger, sadness, fear etc. A trembling lip indicates sadness, trembling body shows fear and nervousness, clenched fists and trembling of your face shows anger, trembling voice indicates embarrassment…
There are a few positive emotions associated with this word: excitement, surprise etc.
This brings to mind a discussion I recently had about Taylor Swift and how she has songs for every emotion; some that I have never heard of before. I don’t know why we discussed Taylor’s songs 😛
Sadness: I knew you were trouble, Story of us, You’re not sorry
Anger: Bad Blood, Picture to Burn, We are never ever getting back together
Happy: You belong with me, Shake it off
Regret: Back to December, Dear John, Wildest Dreams