1.nounAn excess of logs being conveyed on a river, so that their motion halts.
2.nounA clog or such jam or mess that halts or greatly delays progress.
"A step forward for the minimum wage increase this afternoon, as the Senate cleared the logjam of the Republican filibuster. http//www.dailykos.com/storyonly/2007/1/30/13150/5672"