mess with (someone or something)

mess with (someone or something)

1. To change, fiddle, or play with something, often without permission to do so. My tools are not toys—please do not mess with them. Hey, don't mess with the thermostat—it needs to stay at 65 degrees.
2. To clash with someone or something. That group of boys is dangerous—don't mess with them.
3. To tease or mock someone. Sarah's a very sensitive kid, so don't mess with her.
4. To confuse or puzzle someone. One minute he's flirting with me, and the next, he's completely disinterested. His mixed signals are totally messing with my head!
See also: mess
Farlex Dictionary of Idioms.

mess with someone or something

 and monkey with someone or something
to bother or interfere with someone or something. Come on, don't monkey with my new camera. Don't mess with me unless you want trouble.
See also: mess
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

mess with

Interfere or associate with; also, annoy, bother. For example, Our group won't mess with those street musicians, or I told him not to mess with me or there would be trouble. [Colloquial; c. 1900]
See also: mess
The American Heritage® Dictionary of Idioms by Christine Ammer.

mess with

v.
1. To alter something improperly: Don't mess with the arrangement of the chairs—they're all set up for the meeting.
2. To deceive or confuse someone or something: The horrible accident really messed with my head.
See also: mess
The American Heritage® Dictionary of Phrasal Verbs.

mess with someone/something

and monkey with someone/something
in. to bother or interfere with someone or something. Don’t mess with me unless you want trouble. Don’t monkey with the TV. It’s out of kilter.
See also: mess, someone, something
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • mess with
  • mess with someone/something
  • mess of
  • mess of (something)
  • a hell of a mess
  • hell of a mess
  • mell
  • mell of a hess
  • go to press with
  • go to press with (something)