Meaning of 'full steam ahead'

[doanngockhanh]

Test No. incompl/advan-48 "Speed", question 9

Now that the company has made its first million, there's no stopping it and it's full ......... ahead.

(a) power
(b) vapour
(c) strength
(d) steam

Test No. incompl/advan-48 "Speed", answer 9

Now that the company has made its first million, there's no stopping it and it's full steam ahead.

Correct answer: (d) steam
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Hi,

"It's full steam ahead" is an expression to mean what? I don't get this sentence also.

Thank you very much and Best regards
doanngockhanh

[Alan]

This means progress without stopping.
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English as a Second Language
You can read my ESL story A day in the life of a policeman