Gerund: the act or state of making small rapid movements; uncountable or countable in technical contexts.
jitteringgerund / present participle Used as a present-participial adjective describing small rapid movements or nervous trembling.
Her jittering hands revealed her nervousness.
Её трепещущие руки выдавали её нервозность.
The jittering leaves made a soft rustling sound.
Дрожащие листья издавали мягкий шорох.