Keitellä
Keitellä is a Finnish verb meaning to simmer or boil gently in liquid, typically by heating a pot of water, stock, or other liquid. The primary sense is culinary: to cook food by heating it slowly in liquid so that it remains near the boiling point without a vigorous boil. It is commonly used for soups, sauces, and other dishes prepared by simmering.
In everyday use, keitellä often describes the act of cooking something by maintaining a low, steady heat
Figurative use is common in Finnish as well. Keitellä can mean to be brewing or devising something,
Grammar notes: keitellä is a regular Finnish verb. It forms standard person endings in the present tense
Related terms include keittää (to boil, more general), keitto (soup), and keittäminen (boiling, the act of boiling).