price war 
noun
A period of fierce competition in which traders cut prices in an attempt to increase their share of the market: small garages could be forced out of business in the petrol price war...
- At the same time, though, he's raising fears within the industry of a price war.
- Supermarkets and filling stations launched the latest battle in the petrol price war yesterday with a new round of cost cuts at the pumps.
- A good few years back two of the big supermarkets went head to head on these items in a fierce price war.
- have it your (own) way
- have kangaroos in the (or one's) top paddock
- have kittens
- havel
- haveless
- haveli
- havelling
- havelock
- havelock cap
- Havel, Václav
- have many (or other) irons in the fire
- have many strings to one's bow
- have mercy on (or upon)
- haven
- havenage
- have need of/to do something
- havener
- havenership
- have nerves of steel
- havenless
- haven master
- haven mouth
- have no business
- have no concern with
- havenor