pick up on (something)

pick up on (something)

To detect or notice something; to become alert to or aware of something. There are a lot of mature jokes in this cartoon that I never picked up on as a kid. Did you pick up on the hostility between Jen and Tom? The cops picked up on his suspicious behavior right away.
See also: on, pick, up
Farlex Dictionary of Idioms.

pick up on something

to become alert to something; to take notice of something; to learn or catch on to something. She's real sharp. She picks up on everything. The cop picked up on the car with the expired license plates.
See also: on, pick, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

pick up on

Become aware of, notice, as in The teacher picked up on her nervousness right away. [Colloquial; mid-1900s]
See also: on, pick, up
The American Heritage® Dictionary of Idioms by Christine Ammer.

pick up on something

in. to become alert to something; to take notice of something; to learn or catch on to something. She’s real sharp. She picks up on everything.
See also: on, pick, something, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

pick up on

Informal
1. To take into the mind and understand, typically with speed: is quick to pick up on new computer skills.
2. To notice: picked up on my roommate's bad mood and left him alone.
See also: on, pick, up
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • (mother) nature's (something)
  • a slew of (something)
  • a slue of (something)
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • all right
  • (you) wanna make something of it?
  • all for the best