i Register
In some senses, navvy is marked as UK, historical. Watch for register when choosing this word.
noun
A laborer on a civil engineering project such as a canal or railroad.
Suppose two lads, fresh from school, go out into the world to earn their living; one becomes a navvy and one a clerk. In five years' time these two young men will probably be very different in appearance from one another. The navvy will have developed his muscles; he will be broad-built, broad-chested, and strong.
His proper trade's a navvy; and he works at it sometimes too—for exercise—and earns good money at it.
an unskilled laborer
verb
To carry out physical labor on a civil engineering project.
But by pretending to believe he's navvied before, I've given him double reason to drive himself hard.
Before my time of navvying I believe the times were still worse.