They called it a comet, 'for lack of' a better term/word. [=because they could not think of a better term/word for it]
His honesty, or 'lack thereof', is the real problem. [=the real problem is his lack of honesty]
There was 'no lack of' interest in the proposal. [=there was much interest in the proposal]
(..) Bronn managed to keep Shagga which was fortunate, but even still, Ulf is demanding blood money, which Shagga and Gunthor refuse to pay. When soldiers lack discipline, the fault lies with their commander. Surely there are ways to have me killed that would be less detrimental to the war effort. (..)2011 TvShow: Game of Thrones Title: Baelor Season: 1 Episode 9
(..) Hyah! Hyah! Our scouts tell us the Stark host has moved south from the Twins with Lord Frey's levies in tow. They're a day's march north. The boy may lack experience and sense, but he does have a certain mindless... - provincial courage. - Ah. Oh, do continue. Didn't mean to interrupt. (..)2011 TvShow: Game of Thrones Title: Baelor Season: 1 Episode 9