Full Idea
Heidegger concludes that 'logos' essentially means 'making something manifest'.
Gist of Idea
'Logos' really means 'making something manifest'
Source
report of Martin Heidegger (Being and Time [1927], 56/33) by Richard Polt - Heidegger: an introduction 3.§7
Book Reference
Polt,Richard: 'Heidegger: an introduction' [Routledge 2003], p.39
A Reaction
It would at least seem to involve revealing the truth of something, though truth doesn't seem to be central to Heidegger's thought. 'Logos' is often translated as 'an account', as well as a 'reason', so Heidegger may be right.