1. Narrow streets or alleyways that have no exit at one end; a situation with no way out or solution
The old city is full of becos fechados that confuse tourists.
A cidade antiga está cheia de becos fechados que confundem turistas.
2. Figuratively, a situation or problem with no resolution or escape route
The negotiations reached becos fechados and had to be abandoned.
As negociações chegaram a becos fechados e tiveram que ser abandonadas.