If someone stops by your door and asks: ‘What is Truth?’, you pack him a sandwich, show him the ‘Backward Step’, and suggest that he watch-out for falling rocks and deceptively shallow puddles. Other than that, you don’t say a word.
If you must say a word, it may only be as Self-Eating Expression. And its limit is as the Symbol ‘0’.
‘Silence’ [Mounam] has a long history going back to the Māṇḍūkya Upaniṣad and the mystic Mantra AUM. The late-stage teachings were Rahásya, ‘Secret’. [‘Mute’ as in ‘Silent’, is from the Sanskrit Mūka]
But what do you do if accosted in a dark, damp alley with the threat: ‘A Name or your life’?
You reach into your pocket and simple say ‘That’!
‘Truth’, in delightful irony is a chameleon of a word. It derives from the Old-English Treiewo, itself from the Proto–German Treuwaz. Etymological descendant of the Sanskrit Dre and Dhr [as in Dharma], it originally meant ‘Firm, Immovable’.
Around the 14th Century it began a descent in meaning to Fidelity, to a conformance’ [to the situation] and in time to simply as ‘Faith’. Truth in its deepest meaning had something to do with an ‘Unshook Trust’.
As late as the 19th Century Academic philosophers were coming up with ‘Theories of Truth’ which by that very fact vitiates its end. The Consistency Theory of Truth; the Coherence Theory of Truth; the Correspondence Theory of Truth and so on. Plato would have gulped.
If you look up modern dictionary definitions you will find explanations in keeping with the times: ‘Actuality, Certainty, Conformance with Facts, Accord with Reality’ and so on although each of these terms [‘Fact’] would itself require a lengthy elaboration.