Thickening

The fog was thickening quickly.

If it continues to be stimulated the skin's protective function causes thickening and it becomes stiff and hard with pores that stand out.

Corn starch is good for thickening soup.

A heavily timbered park stretched up in a gentle slope, thickening into a grove at the highest point. From amid the branches there jutted out the gray gables and high roof-tree of a very old mansion.

Meanwhile a mingled murmur through the street / rolls onward – wails of anguish, shrieks of fear –, / and though my father's mansion stood secrete, / embowered in foliage, nearer and more near / peals the dire clang of arms, and loud and clear, / borne on fierce echoes that in tumult blend, / war-shout and wail come thickening on the ear.

Cornflour is good for thickening soup.

Cornstarch is good for thickening soup.

The doctor was Lawrence Craven. He observed unusual bleeding among children who chewed an aspirin gum to ease pain after a throat operation. Doctor Craven believed they were bleeding because aspirin prevented the blood from thickening or clotting. He decided that aspirin might help prevent heart attacks caused by blood clots in blood vessels.

[…] the inner layer (of nearly equally large cells) lacks the regular semiannular or annular thickenings of most other leafy liverworts […]

They disappear at once on slightly relaxing the air-pressure, whilst true incipient thickenings of the surface remain white and unpliably stiff.