A long, narrow track in the ground made by wheels.

• A groove formed by repeated wear on a surface.

A fixed, monotonous routine that is hard to escape.

• A period of personal or work stagnation.

The mating season in some mammals, especially deer.

• The excited state of males during that period.

To form tracks or grooves in a surface.

• To become worn into ruts by repeated use.

Of male deer and other mammals, to be in mating season.