As the septum primum grows, the ostium primum narrows and eventually closes. It narrows as it rises, measuring below the lintel. The Colorado River narrows to slightly under wide in one area. Near Cooper Landing, the lake narrows to form the river. In a convergent nozzle, the ducting narrows progressively to a throat. The cervix gradually narrows and lengths over a few weeks. In May 1954, the Army's permit for starting construction on the Narrows Bridge lapsed. To the west, it narrows into the Gulf of Tadjoura, in the Horn of Africa. Here, the road narrows back to four lanes through suburban development near Middletown. The route is difficult to navigate due to frequent narrows and unpredictable winds and currents. After these interchanges, the Beltway then narrows to eight lanes again. Atherosclerosis narrows blood vessels in the brain, resulting in decreased cerebral perfusion. The blade narrows behind the cutting edge to provide clearance. He lived in New York City and owned a lot on the Lake Manitoba Narrows. However, agreement in Korean usually only narrows down the range of subjects.