heat up
US /hiːt ˈʌp/
UK /hiːt ˈʌp/

1.
2.
calentarse, intensificarse
to become more intense or exciting
:
•
The debate started to heat up as both sides presented their arguments.
El debate comenzó a calentarse a medida que ambas partes presentaban sus argumentos.
•
The competition is really starting to heat up.
La competencia realmente está empezando a calentarse.