put somebody/be at a disadvantage

be at a disadvantage

To be in an unfavorable position compared to others. They knew for weeks, but I'm just getting all of this information now—I'm at a disadvantage here. You'll be at a disadvantage playing against a player as skilled as Katie.
See also: disadvantage

put (one) at a disadvantage

To cause one to be in an unfavorable position compared to others. John knew about the deal for weeks, but I'm just getting all of this information now—he's putting me at a disadvantage here! She was put at an immediate disadvantage playing against the top seeded tennis player in the first round of the tournament.
See also: disadvantage, put
Farlex Dictionary of Idioms.

put somebody/be at a disadˈvantage

make it/be difficult for somebody to succeed: My lack of experience put me at a disadvantage in comparison with the other candidates for the job.
See also: disadvantage, put, somebody
Farlex Partner Idioms Dictionary
See also:
  • be at a disadvantage
  • at a disadvantage
  • address (one's) comments to (someone or something)
  • address comments or remarks to
  • address (one's) remarks to (someone or something)
  • be in it for
  • be more than (something)
  • be more than glad, ready, etc.
  • away from it all
  • be out of (one's) head