thicken

• The air seemed to thicken, as if filling with smoke, which drew together in a place about four feet in front of him, clotting like dark, viscous cream into something dense, almost solid. —  The Wheel of Darkness by Douglas Preston and Lincoln Child
• The extended legs seemed to thicken, as if new muscle was reforming there, and the belly flattened. —  Warhorse
• This time clouds did not form and thicken, the opposite was the case. —  Xone of Contention
• By eleven the clouds again began to thicken, and grew so dark upon their under edges that we feared rain. —  The Continental Monthly, Vol. 6, No. 6, December 1864 Devoted To Literature And National Policy
• Stir until the mixture begins to thicken, then blend a raw yolk and add it to the haddie. —  The Community Cook Book

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