1. (

• thicken ,
• inspissate ,

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

2. (

• thicken ,
• inspissate ,

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

3. (

• thicken ,
• inspissate

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