To reduce a perfect or minor interval by a semitone. (verb)
Examples of word diminish
The Dative of Reference denotes the person _to whom a statement refers, of whom it is true_, or _to whom it is of interest; _ as, -- mihi ante oculÅs versÄris, _you hover before my eyes_ (lit. _hover before the eyes to me_); illÄ« sevÄ“ritÄs amÅrem nÅn dÄ“minuit, _in his case severity did not diminish love_ (lit. _to him severity did not diminish_); interclÅ«dere inimÄ«cÄ«s commeÄtum, _to cut of the supplies of the enemy.
"Uncharted 2" or "BioShock 2," I'm not going to let that number in the title diminish my enjoyment.
It is a known fact that the quantities of chemicals secreted by the brain diminish astronomically from the early 20's to late 70's.
Woodward first appears to again diminish his earlier statement by saying that Bandar had publicly stated that the Saudis would like to see oil prices below the $30 range (i.e., he's suggesting that what Bandar may or may not have told the president in private was the same thing Bandar subsequently said publicly).
However, the intended Japanese audience would have known this already and it did not diminish from the devastating sadness of the ending.