thickening

fe’l verb

1. To make thicker (in the sense of more viscous). to thicken a sauce
2. To make more frequent. to thicken blows
3. To make thicker (in the sense of wider).
4. To become thicker (in the sense of wider).

ot noun

1. The process of making something, or becoming, thick or viscous.
2. A substance, usually a source of starch, used to thicken a sauce.
3. A thickened part of a structure.