cook, boil
炊 centers on applying heat to prepare food, especially by boiling or cooking grains. The core idea is cooking with water and fire.
炊 combines 火 (fire) and 欠, which here likely represents a person blowing or breathing, suggesting cooking by blowing on a fire. The exact historical role of 欠 is uncertain, but the fire component clearly relates to cooking.
Fire 火 on the left and a person blowing 欠 on the right: imagine someone blowing on a fire under a pot to cook rice or boil water.
For スイ, picture a cook blowing on the fire to make the water in the pot sway (スイ) as it boils: sway -> スイ.
to cook (grains, e.g. rice)
rice cooking; boiling rice
cooking for oneself; cooking one's own food; doing one's own cooking; making food oneself; self-catering
(something) cooked with rice
rice gruel containing vegetables, fish, etc., and seasoned with miso or soy sauce
cooking; kitchen work
to be boiled; to be cooked; to be done; to be ready
food distribution (esp. cooked rice)
food (esp. chicken and vegetables) boiled in plain water (or sometimes dashi, etc.) and served with dipping sauce (esp. ponzu)
freshly boiled (rice); freshly cooked; steaming; piping hot
cooking
cooking rice; kitchenmaid; cook
having a cooking capacity of one liter
empty dream
community kitchen
food cooked in miso; cooking in miso
Bureau of the Imperial Palace Kitchens (under the ritsuryō system)
dish of the same ingredient prepared two different ways, stewed together (esp. tofu, specialty of Kyoto)
cooking (rice) quickly (e.g. by using a quick cook function on a rice cooker); quick cook
boiling (esp. rice)