keeps one nose grindstone (verb) keep one's nose to the grindstone: work doggedly
Sinonime: banned, barred, closed down, contraband,
crooked*,
illegal,
illicit, no-no, not allowed, not approved, off limits, out of bounds, out of line, proscribed, refused,
restricted,
shady*, taboo, verboten, vetoed, wildcat
Antonime: allowed, permitted