To become septic; to become rotten.
To worsen, especially due to lack of attention.
To cause to fester or rankle.
The condition of something that festers; a festering; a festerment.
A sore or an ulcer of the skin.
To develop, to mature.
To appear or sprout.
To become larger, to increase in magnitude.
To undergo growth; to be present (somewhere)
To cause or allow something to become bigger, especially to cultivate plants.
To assume a condition or quality over time.