Юридически английски език (ESP: Legal English)

action and suit. A mode of proceeding in court to enforce a private right, to redress or prevent a private wrong, or to punish a public offence. Originally, action referred exclusively to proceedings in a court of law, while suit referred to proceedings in chancery (equity), as well as prosecutions at law. Today since virtually all jurisdictions have merged the administration of law and equity, the terms action and suit are interchangeable.

A Dictionary of Modern Legal Usage