Focus on the pronunciation of harden
English definition of “harden”
/ˈhɑːdən/ verb [I] UK FINANCE, STOCK MARKET
› if prices or share prices harden, they increase: If the oil price hardens this week and remains high, there will be some effect on fuel prices by the end of this week. The pharmaceuticals company hardened 33p at £26.07 on speculation of predatory interest from a Swiss firm.