To develop together.

(organic chemistry) A pesticide synergist which increases the potency of other ingredients; a semisynthetic derivative of safrole that is used to enhance the potency of certain pesticides.

(transitive, parapsychology) To establish contact with or to receive via telepathy. / (intransitive, parapsychology) To engage in telepathic communication.

(idiomatic) In a straight line distance between two locations, as opposed to the road distance or over land distance.