익다

For a fruit or seed to become ripe.

For raw meat, vegetables, grains, etc., to be changed in taste and characteristics after being heated.

For gimchi/kimchi, alcoholic bevarage, jang, Korean sauce, etc., to be deliciously fermented.

For the skin to turn red after being exposed to a fire or sunshine for a long time or coming in contact with something hot.

For a thing, timing, atmosphere, etc., to become sufficiently ready or appropriate.

익은 밥 먹고 선소리한다

To say something illogical.