high heat; high flame
Used in cooking to describe a strong flame or high heat setting, often contrasted with 弱火 (low heat).
Antonyms: 弱火
Please stir-fry quickly over high heat.
鍋を強火にかけて沸騰させる。
Put the pot on high heat and bring it to a boil.
low heat; low flame; simmering
Compound of 強 (strong) and 火 (fire). The reading つよび is a straightforward kun'yomi combination.