Trembling is an erratic, or periodic spasm of motion typically caused by excitement, anxiety, or weakness. Trembling tends to not be as rapid as shivering.

Not to be confused with

• throbbing - Throbbing is for tagging purposes a distinct concept, but may borrow the same motion indicators as a trembling scene might feature.

Related tags

• motion_lines
• tremble_spikes - These spiky lines may represent trembling, or throbbing. It should not imply trembling.