allude

This verb describes a subtle form of communication where the speaker relies on the listener's prior knowledge to fill in the gaps. It carries a connotation of discretion, evasion, or strategic vagueness, often used when a topic is too sensitive, scandalous, or obvious to be addressed directly.

Grammatically, this word is strictly intransitive and requires the preposition to. Using it without to or as a transitive verb is a common error; one does not allude a topic, but rather alludes to it.