From LOTR-TCG Wiki

Milling is an informal game term. Milling means to discard cards from the top of a deck. "Mill" on its own implies discarding cards from your opponent's decks, but some cards "self-mill," discarding cards from your own deck for some benefit. Dwarven culture specializes in both, with cards like Dwarven Axe (1C9) and Realm of Dwarrowdelf (2R12) . Mill strategies often combine with discard strategies, because forcing your opponent to discard cards means they draw more cards when they reconcile, burning through their deck more quickly.

Self-mill decks often use cards like Úlairë Nertëa, Messenger of Dol Guldur (1U234) or Preparations (7R12) to fetch lost cards from your Discard Pile. Self-mill decks also often use cards like Ring of Artifice (17R4) or Úlairë Lemenya, Dark Enemy (19P37) , which are empowered by spotting cards in your discard pile.

The term comes from Magic: the Gathering, so named after the card Millstone.

Game Setup Starting FellowshipBiddingMulligan
Deck Building Considerations UniquenessX-ListR-ListErrataFormat
General Strategies BeatdownBombCorruptionHand ExtensionRun/StopSkirmish CancellationSwarmWin ConditionWound PreventionWounding
Deck Archetypes Auto-Corruption BombBeasterlingsBerserkersBouncing HobbitsElventsForestgulsHobbit HospitalFruit LoopsGondor KnightsGondor RangersGondor WraithsMoria ArcheryMoria BeatdownMoria NavyMoria SwarmMoria TentaclesNazgul BeatdownNinja GollumOrc CorruptionRainbow WoundingSauron GrindSauron InitiativeSauron RoamingSauron ThreatsSolo SmeagolSouthron ArcherySouthron InitiativeStupid SwarmSuper FriendsTelepathyThreatgulsToken TanksTroll SwarmUruk ArcheryUruk MachinesUruk TrackersWarg Super Swarm
Rules Rule of 4Rule of 9
Mechanics BearDiscardDraw DeckExertExhaustedFellowshipInitiativeIn Play/Leave PlayMove LimitReconcileRoamingSite ControlSpotStackSupport AreaThreats
Gameplay Terms BoatBodyBroken/NPE/OPBuff/NerfChokeComboCultural EnforcementCyclingDead DrawFetchFilterFloodGrindHand ClogHateInteractionItemLoopMatchupMetaMillNewbie TrapPilePower CreepPumpRainbowRecursionRemovalResourceRogueRule of 6SideSite ManipulationSpeed BumpSplashSubcultureTankOther Terms