smooth down
US /smuːð daʊn/
UK /smuːð daʊn/

1.
2.
calmar, suavizar
to calm or soothe someone, especially after they have been upset or angry
:
•
He tried to smooth down the angry customer.
Intentó calmar al cliente enojado.
•
Her kind words helped to smooth down the tension in the room.
Sus amables palabras ayudaron a suavizar la tensión en la habitación.