put on

1.  Clothe oneself with, as in I put on my socks. [Mid-1400s]
2.  Apply, activate, as in He put on the brakes. [Mid-1700s]
3.  Assume affectedly, pretend to, as in He put on a British accent. This idiom is sometimes put as put it on, as in He's not really asleep; he's putting it on. [Late 1600s; late 1800s]
4.  put someone on. Tease or mislead another, as in I don't believe you! You're putting me on. [Slang; mid-1900s]
5.  Add to, gain, as in Please put this on our bill, or I've put on some weight.
6.  Cause to be performed, produce, as in I hear they're putting on Shakespeare this summer. [Late 1800s]

Definition: pretend
Antonyms: be truthful

The verb has 9 meanings:

Meaning #1: put clothing on one's body
  Synonyms: wear, get into, don, assume

Meaning #2: add to something existing

Meaning #3: put on the stove or ready for cooking

Meaning #4: carry out, as of performances: "They turned in a splendid effort"
  Synonym: turn in

Meaning #5: add to the odometer

Meaning #6: prepare and supply with the necessary equipment for execution or performance
  Synonym: mount

Meaning #7: apply to a surface
  Synonym: apply

Meaning #8: fool or hoax
  Synonyms: gull, dupe, slang, befool, cod, fool, take in, put one over, put one across

Meaning #9: increase (one's body weight)
  Synonym: gain

The adjective put on has one meaning:

Meaning #1: adopted in order to deceive
  Synonyms: assumed, false, fictitious, fictive, pretended, sham