the port lock
The longest lock on the River Thames is Teddington Lock. Teddington Lock also contains the smallest lock on the Thames, which is located in England.
Lock
One long blast on the boat's horn or whistle indicates to the river lock attendant that you wish to go through the lock.
Tides as far up river as Teddington Lock and heavy rainfall in the rest of the river.
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The first person present tense of the word "lock" is "lock."
First lock it
To alert a river lock attendant that you wish to go through the lock, you usually sound your horn or whistle in a specific sequence as defined by the lock operation rules. Typically, this involves a series of long and short blasts to communicate your intention to pass through the lock.
The river Thames is tidal as far upstream as Teddington Lock which is in a suburb of West London.
Green
Green