възпрепятствам означава в английски

frustrate [frustrated, frustrating, frustrates]▼(to hinder)
verb
[UK: frʌ.ˈstreɪt] [US: ˈfrə.ˌstret]

sabotage [sabotaged, sabotaging, sabotages]▼(deliberate destruction to prevent success)
verb
[UK: ˈsæ.bə.tɑːʒ] [US: ˈsæ.bə.ˌtɑːʒ]