obscure
v.v. to hide something or make it difficult to see, hear, or understand. You use this when clouds cover the sun, or when someone uses confusing words to hide the truth.
v. to conceal or make something difficult to perceive or understand.
Thick clouds started to obscure the sun just before the storm hit.
The politician used long, complicated sentences to obscure the fact that he had no real plan.
The manager's deliberate use of technical jargon served only to obscure the underlying financial risks, leaving the board unaware of the impending crisis.
From Middle English obscure, from Old French obscur, from Latin obscūrus (“dark, dusky, indistinct”), from ob- + scūrus, from Proto-Italic skoiros, from Proto-Indo-European *(s)ḱeh₃-. Doublet of oscuro.
The verb is transitive and takes a direct object; it applies equally to physical concealment and the deliberate hiding of facts.