To render dense; to inspissate; as, to thicken paint.

make thick or thicker; "Thicken the sauce"; "inspissate the tar so that it becomes pitch"

become thick or thicker; "The sauce thickened"; "The egg yolk will inspissate"

make viscous or dense; "thicken the sauce by adding flour"

To make a thick, smooth paste by mixing together arrowroot, cornflour or flour, with an equal amount of cold water; stir into the hot liquid and cook, stirring until thickened.

To make a liquid more thick by reducing or adding a roux, starch, or eggs.

To make a liquid thicker (denser), usually by adding flour, cornstarch or beaten egg, then cooking the mixture.

To make a liquid dense by adding flour, cornstarch, egg yolks, rice or potatoes.