keep (your) nose to the grindstone

to continue to work very hard, without stopping.

I've only got six weeks before my exams start so I'm trying to keep my nose to the grindstone.

• trust an inch
• trust someone an inch
• Truth will out.
• try for size
• try hand at
• try hand at something
• try it on
• try luck
• try on
• try on for size
• try on something
• try out
• try out for
• try out for something
• try out on
• try out on someone
• try something for size
• try something on for size
• try something out on
• try something out on someone
• try the patience of
• try the patience of someone
• try wings
• try your hand at
• try your hand at something