To dream of a cash register represents confrontation with the reality of your choices. Realizing the personal cost or consequences of a choice.
Standing at a cash register and noticing the price may reflect a pivotal moment where you are noticing the personal cost of a choice you’ve made before going through with it. Negatively, a cash register may reflect a moment where you are asking yourself “What have I done to get here?”
To dream of working behind a cash register may reflect your attempt to make someone else aware of the costs of their decisions.