BIT OF A GRIND is an expression used to describe a task that is difficult and tedious. The crossword solutions for this term are CHORE (5 letters) and GNASH (5 letters). CHORE is a task or duty that is often unpleasant but necessary, while GNASH is to grind or strike the teeth together in anger or frustration. Together, these two words accurately describe the feeling of having to do something that is difficult and tedious.