Trust always involves a third relation: A trusts B to do X. [definitional]
Trust is a three-part relation: A trusts B to do X, and even this is restricted to certain contexts and ranges over degrees of trust. The fourth and fifth slippages involve the reduction of trust to a two-part relation. In our daily invocations of trust we commonly do not include the third part. This might merely be an ellipsis of what we mean, but it might also begin to inform what we think, so that I begin to assert that I trust you, purely and simply, as though with respect to anything and everything.
DEFINE: Defines trust as a three-part relation with an object of trust, arguing that collapsing it to a two-part relation is a slippage that can reshape our thinking.
Russell Hardin, Trust and Trustworthiness, loc. 292