jack up (something)
to raise prices, to raise something with a lifting device
The gas station jacked up their gas prices during the storm. We jacked up the car so that we could change the tire.
Precautions while using Refrigerators
Do not spray the refrigerator
Do not spray the refrigerator with waterwhile it is plugged in, as it may cause anelectric shock.Commercial refrigerator and freezer units, which go by many other names, were in use for almost 40 years prior to the common home models. They used gas systems such as ammonia (R-717) or sulfur dioxide (R-764), which occasionally leaked, making them unsafe for home use. Practical household refrigerators were introduced in 1915 and gained wider acceptance in the United States in the 1930s as prices fell and non-toxic, non-flammable synthetic refrigerants such as Freon-12 (R-12) were introduced. However, R-12 damaged the ozone layer, causing governments to issue a ban on its use in new refrigerators and air-conditioning systems in 1994.