1. A system of gates and chambers used to raise or lower vessels between different water levels in a canal or river
The ship passed through the lock to enter the higher canal level.
O navio passou pela eclusa para entrar no nível mais alto do canal.
2. A chamber or compartment fitted with gates at both ends, used to pass boats through
The barge waited in the lock chamber before the gates opened.
A barca esperava na câmara da eclusa antes das comportas se abrirem.