thicken up

thicken up

To become or cause something to be thicker, broader, or denser. A noun or pronoun can be used between "thicken" and "up." Leave the soup on a low heat for another hour so that it thickens up a bit. If your batter is too runny, add a bit of flour to thicken it up. They've put me on a calcium supplement to help thicken up my bones.
See also: thicken, up
Farlex Dictionary of Idioms.

thicken something up

 
1. to make something, such as a fluid, thicker. I have to thicken this gravy up before we can serve dinner. Please thicken up the gravy before you serve it.
2. to make something wider. See this line here? You need to thicken it up so that it shows more clearly. Try to thicken up the line a little.
See also: thicken, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

thicken up

v.
1. To become thicker or denser: The gravy thickened up.
2. To cause something to become thicker or denser: I thickened the batter up by adding more flour. The cook thickened up the fudge.
See also: thicken, up
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • adapt (something) to (something)
  • adapt to
  • involve with
  • involve with (someone or something)
  • involved with
  • arrange for
  • arrange for some time
  • arrange some music for
  • back into
  • back into (someone or something)
References in periodicals archive
Paul Mitchell Extra Body Thicken Up, PS12.95 @ HQHAIR.com Separate the underneath section of your hair and backcomb the roots of the top section.