/ˈdʒɪtə/
NO OBJECT Act nervously.
an anxious student who jittered at any provocation

object:
(grammar 语法) a noun, noun phrase or pronoun that refers to a person or thing that is affected by the action of the verb (called the direct object), or that the action is done to or for (called the indirect object) 宾语(包括直接宾语、间接宾语)

jittery