THWART

Foil

• Block

• Defeat

• Effectively oppose

• Foil the plans of

• Frustrate

• Hinder

• Keep from happening

• Oppose successfully

• Prevent from happening

• Short-circuit

• Stymie

• Stymie, as plans

• Wreck the plans of

• A crosspiece spreading the gunnels of a boat

• Used as a seat in a rowboat