tell from

tell (someone or something) from (someone or something else)

1. To be able to discern or distinguish some thing as being distinct and unique compared to something else. It's very difficult to tell the real paintings from the counterfeits, but there are a few things we can look for to be sure. Because of my color blindness, I can't tell shades of red from shades of green. The princess dressed so plainly that you couldn't tell her from an ordinary citizen.
2. To be able to perceive, recognize, or understand something from some piece or amount of evidence. In this usage, the noun or pronoun between "tell" and "from" is sometimes relocated to the end of the clause. What's wrong? I can tell you're upset from the tone in your voice. Well, we can tell from these markings that the herd is moving towards the north.
See also: something, tell
Farlex Dictionary of Idioms.

tell something from something

to know something because of something, such as evidence, signs, experience, etc. I can tell that she's lying from the way she holds her eyebrows. I can't tell anything from what you told me.
See also: tell
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

tell from

v.
To perceive something as being different or distinct from something else: I couldn't tell the homemade cookies from the ones that were bought at the store.
See also: tell
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • tell (someone or something) from (someone or something else)
  • tell from else
  • tell from else Go to tell from
  • tell the difference between
  • tell the difference between (someone or something)
  • tell things apart
  • tell people or things apart
  • tell apart
  • tell (someone or something) apart
  • tell (someone or something) by (something)
References in periodicals archive
"This is a real killer, you can tell from his moves." That's what Tony was thinking.