Starting your own business can be very tough, but you just have to 'grit your teeth' and keep working at it.
Through resourcefulness and 'grit', the pioneers survived the winter.
He shook out his shoes to remove the small rocks and 'grit'.
(..) And I said yes! Bloody hell. She's lying, right? If you say so. Look, we've just gotta grit our teeth and do it. Tonight, when we get back to the common room, we'll both have partners. Agreed? Agreed. - Cho! - Harry! (..)2005 Harry Potter and the Goblet of Fire