backward and forward

• Expresión idiomática que significa movimiento repetido en direcciones opuestas, o un conocimiento profundo y completo de algo.

An idiomatic expression meaning to move repeatedly in opposite directions, or to know something thoroughly and in great detail.

1. Thoroughly or completelyB2informalamerican

   To know something very well, in every detail.

   de pe a pa

   • He knows the city backward and forward.
   • She knows the script backward and forward.
   • I know this system backward and forward.

2. Movement in both directionsB1formal

   Moving repeatedly in one direction and then the opposite direction.

   de un lado para otro

   • The pendulum swung backward and forward.
   • He paced backward and forward in the waiting room.
   • The boat rocked backward and forward on the waves.