collateral estoppel

Definition

The doctrine preventing parties from re-arguing facts that have already been decided in a previous case. It's like judicial recycling—why waste time re-proving something everyone already settled?

Example Usage

Because of collateral estoppel from the criminal trial, we don't need to prove he was at the scene—that's already been established.

Origin

From common law, with 'estoppel' derived from Old French 'estoupail' meaning 'stopper'

Fun Fact

Collateral estoppel is basically res judicata's more specific cousin—res judicata bars whole cases, while collateral estoppel bars specific issues.

Source: Common civil procedure terminology

Related Terms

Advanced

acquiescence

Passive acceptance or silent agreement to something, often implying you're not thrilled about it but won't actively oppose it either. In legal terms, it's when your failure to object or take action implies you've abandoned your rights. Think of it as the legal equivalent of shrugging and moving on—except it can cost you your claim later.

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advocate

A professional arguer who gets paid to passionately champion causes, clients, or cases they may or may not personally believe in. These persuasion specialists range from courtroom lawyers arguing legal technicalities to policy wonks lobbying for legislation to activists fighting for social change. The term conveniently sounds more noble than "hired gun" while describing essentially the same function.

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claimant

The optimistic soul who initiates a legal claim, demanding money, benefits, or justice from someone who probably disagrees with their interpretation of events. Whether seeking unemployment benefits, insurance payouts, or damages in a lawsuit, the claimant is the one who shows up saying 'I'm owed something.' They're the protagonist in their legal story, though the defendant might describe them differently.

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summary judgment

A judge's decision to resolve a case without going to trial because there are no genuine disputes about the material facts. It's the legal equivalent of calling a game due to rain when one team is up 50-0.

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Precedent

A previous court decision that future judges use to make their decisions, because apparently the legal system works like a game of "well, someone did it this way before." It is basically legal copy-paste.

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petitioner

The person who initiates a legal proceeding by filing a petition, essentially the one who gets the ball rolling on your date with the judicial system. In appeals, they're the party asking the higher court to review the lower court's decision, usually because they lost and would like a second opinion. The formal legal term for "the one who complained first."

⚖️ Legal

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