Definition of "go-to"

go-to

adjective
not comparable
1. Desired; desirable; of choice.
  Quotations
  The USA Network, let's face it, isn't anyone's go-to channel.
  2003 July 7, New Yorker, page 78
2. Reliable; likely to perform in difficult circumstances.
noun
plural go-tos
1. A person or thing that is one’s usual choice.