companion, escort
Esta tarde seré tu acompañante.
I will be your companion this afternoon.
— El castillo ambulante (2004)
Vendrá a la fiesta con Alan y yo seré su acompañante.
She'll come to the party with Alan and I'll be her date.
— Picnic (1955)
I don't know if they had a companion.
A tu acompañante le ha mordido una serpiente.
Your companion has been bitten by a snake.
— Rashomon (1950)