I have two new posts up at Macmillan Dictionary Blog. The first, False and flying colours in metaphor, looks at a particular sense of the word colours that refers to flags, in turn an abstraction of identity:
Like many phrases now in common figurative use, with flying colours was literal at first (inasmuch as hanging a flag is literally flying it). But the expression, with its vivid imagery and connotations of success, has obvious appeal, and people duly broadened it to refer to achievements unaccompanied by flag-flying.
A related expression, also of naval pedigree, is to sail [or fight] under false colours, synonymous with under false pretences. It refers to an old seafaring trick associated with pirates but not limited to them, who misrepresented their identity by hoisting ‘friendly’ flags, and so were able to get close enough to a target ship to catch its crew unawares.
You can read the rest for more on the origins and uses of these metaphors.
Some back formations are deliberately comical. Jack Winter’s essay ‘How I Met My Wife’ features such novelties as chalant and petuous (from nonchalant and impetuous); here, the removal of prefixes rather than the usual suffixes gives them a playful feel. Other back formations are obviously redundant, such as conversate, cohabitate, and evolute. The use of these and similar words is likely to invite criticism and complaint – sometimes unfounded, as with orientate. Certain others, such as enthuse, occupy a grey area of acceptability.
More often, back formations are developed because there’s a need for them. Surveil is a case in point.