1. To block up; to interpose obstacles; to render impassable; to fill with barriers or impediments; as to obstruct a road or way. 2. To impede or hinder; to interpose ob struct an officer in the execution of his duty. Davis v. State, 76 Ga. 722. 3. As applied to navigable waters, to “ob in their maneuvers. 4. As applied to the operation of rail man approaching on the track. Nashville