like greased lightning
US /laɪk ɡriːst ˈlaɪt.nɪŋ/
UK /laɪk ɡriːst ˈlaɪt.nɪŋ/

1.
come un fulmine, velocissimamente
very quickly or rapidly
:
•
When the bell rang, the children ran out of the school like greased lightning.
Quando suonò la campanella, i bambini corsero fuori dalla scuola come un fulmine.
•
He finished his homework like greased lightning so he could go out and play.
Ha finito i compiti come un fulmine per poter uscire a giocare.