/ˈsɛkənˌdɛri ˈækʃən/ – Phrase
Definition: vụ kiện phụ.
A more thorough explanation: Secondary action is a legal term primarily used in labor law, referring to a strike or other concerted activity by workers who are not directly involved in a primary dispute but who support the primary strikers.
Example: A sympathy strike, where workers at a different company strike in solidarity with workers at another company involved in a labor dispute, is a common example of a secondary action.