Create a context of meaning that is not “fully plumbable”?.    From Wordnik.com.  [Carver and authorial intention] Reference

There was no cliché too stretched, no depth un-plumbable for us.    From Wordnik.com.  [Telegraph.co.uk: news, business, sport, the Daily Telegraph newspaper, Sunday Telegraph] Reference

A lumbering no less appalling than the moonscape of my face and its billion plumbable pores.    From Wordnik.com.  [APM: Garrison Keillor's The Writer's Almanac RSS Feed] Reference

Or means changes whose depths aren’t fully plumbable and hence are best described in a hyperbolic sense as impossible.    From Wordnik.com.  [Carver and authorial intention] Reference