think twice (about something)
to think very carefully about something
"You should think twice before you quit your job."
Precautions while using Washing Machine
Top load machines
The price of top load machines vary from Rs. 12,000 to Rs. 28,000 depending on the brand. Clothes are loaded from the top into a drum mounted vertically and rotates horizontally. It has an agitator and pulsator a propeller, for better wash quality. A major disadvantage with this type is that one cannot reuse water and hence, water usage exceeds that of semi automatic machines. Also, when the washing is in progress, one cannot add clothes without switching the machine off. The power consumption of these machines is 1500 watts per hour of usage.