In Spanish parar is a verb, means ‘to stop’. In tango this is a concept, not a single specific step.
When speaking about dancing a parada it does not mean literally ‘a stop’. In Tango dancing it means a pause or (temporary suspension) stop in movement. However even a simple idea such as this is not a ‘dead’ stop, but is more dynamic. One should still feel the connection with your partner, the dance and the music.