When you say something but don't *specifically* mention other details or all of details? For example: Say I'm trying to buy a computer and I say it MUST be the cheapest there is and go post this on a forum asking for others opinions. Then I get some replies back saying... Poster: "Oh get this computer, it's really cheap!" Me: "I've heard about them, they may be cheap but not very reliable." Poster: "Well you said you wanted cheap, you never said you wanted it to be reliable as well!" Me: "Well of course I want it to be reliable, how else will it last?!" Poster: "Well if that is so, why didn't you mention so? If you don't mention it, I assume all you want is cheap and nothing else/more" Me: "Well I thought it was common sense to be also trying to get something cheap AND reliable and hence there was no need to include said detail...." ... [and the argument goes on...] I had a similar experience(my experience was that he was trading away some stuff, and said he wanted this in return for this, and I offer him something else instead, and he goes did u not read? I want this. And I reply with well you didn't specifically mention you do NOT want other offers, and so I presumed it was ok to offer you something else.....and yeah it goes from there..) and someone actually posted a link to wikipedia(which explained it all - including a word/phrase that defines this exact *thing*...) but I forgot what it was called so I can't really google said word up for said wikipedia page nor I know where said post was anymore....probably deleted now..