Definition from Wiktionary, the free dictionary
logjam (plural logjams)
- An excess of logs being conveyed on a river, so that their motion halts.
- (figuratively) A clog or such jam or mess that halts or greatly delays progress.
- Efforts to amend the law got sidetracked in an administrative logjam.
- A step forward for the minimum wage increase this afternoon, as the Senate cleared the logjam of the Republican filibuster. 
A clog; any jam or mess that halts or greatly delays progress