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]
(..) Almost at odds with morning, which is which. How say'st thou that Macduff denies his person at our great bidding? You lack the season of all natures. Sleep. MACBETH: 'I will to the Weird Sisters. 'More shall they speak. 'For now I am bent to know by the worst means the worst. (..)2015 Macbeth
(..) This is the air-drawn dagger which you said led you to Duncan. Why do you make such faces? If I stand here, I saw him. My worthy Lord, your noble friends do lack you. Blood hath been shed ere now, in the olden time. The time has been that, when the brains were out, the man would die (..)2015 Macbeth