If you go full steam ahead, you do something with enthusiasm, energy and determination.
We must get this project finished before the presentation tomorrow. Come on, full steam ahead, team!
Natalie went full steam ahead with the plans for her wedding.
John, Sarah and Michael went full steam ahead in their attempt to climb Mount Kilimanjaro.
If you let off steam, you release your anger or frustration, often by shouting.
I'm sorry I shouted at you earlier, I was just letting off some steam.
The London Underground network, often referred to as the Tube, celebrated its 150th anniversary recently. Special events were held across the network, with some lucky passengers being allowed to travel on this steam train, which was built in 1898.