Bones and Grind away

Bones noun - A percussion instrument consisting of a pair of hollow pieces of wood or bone (usually held between the thumb and fingers) that are made to click together (as by Spanish dancers) in rhythm with the dance.

Grind away is a synonym for bones. In some cases you can use "Grind away" instead a verb "Bones".

Grind away verb - Study intensively, as before an exam.

Bones is a synonym for grind away. Sometimes you can replace term "Bones" with "Grind away", this verbs are similar.