Scare quotes

Scare quotes (also called shudder quotes, sneer quotes, and quibble marks) are quotation marks that writers place around a word or phrase to signal that they are using it in an ironic, referential, or otherwise non-standard sense. Scare quotes may indicate that the author is using someone else's term, similar to preceding a phrase with the expression "so-called"; they may imply skepticism or disagreement, belief that the words are misused, or that the writer intends a meaning opposite to the words enclosed in quotes.
History.
Elizabeth Anscombe coined the term "scare quotes" as it refers to punctuation marks in 1956, in an essay entitled "Aristotle and the Sea Battle", published in "Mind". The use of a graphic symbol on an expression to indicate irony or dubiousness goes back much further: Authors of ancient Greece used a mark called a "diple periestigmene" for that purpose. Beginning in the 1990s, the use of scare quotes suddenly became very widespread. Postmodernist authors in particular have theorized about bracketing punctuation, including scare quotes, and have found reasons for their frequent use in their writings.
Usage.
Writers use scare quotes for a variety of reasons. They can imply doubt or ambiguity in words or ideas within the marks, or even outright contempt. They can indicate that a writer is purposely misusing a word or phrase or that the writer is unpersuaded by the text in quotes, and they can help the writer deny responsibility for the quote. In general, they express distance between writer and quote.
For example: The scare quotes could indicate that the word is not one the writer would normally use, or that the writer thinks there is something dubious about the word "groupies" or its application to these people. The exact meaning of the scare quotes is not clear without further context.
The term "scare quotes" may be confusing because of the word "scare". An author may use scare quotes not to convey alarm, but to signal a semantic quibble. Scare quotes may suggest or create a problematization with the words set in quotes.
Criticism.
Some experts encourage writers to avoid scare quotes because they can distance the writer and confuse the reader.
Editor Greil Marcus, in a talk at Case Western Reserve University, described scare quotes as "the enemy", adding that they "...kill narrative, they kill story-telling ... They are a writer's assault on his or her own words." Scare quotes have been described as ubiquitous, and the use of them as expressing distrust in truth, reality, facts, reason and objectivity.
Political commentator Jonathan Chait wrote in "The New Republic", "The scare quote is the perfect device for making an insinuation without proving it, or even necessarily making clear what you're insinuating."
In 1982, philosopher David Stove examined the trend of using scare quotes in philosophy as a means of neutralizing or suspending words that imply cognitive achievement, such as "knowledge" or "discovery".
In speech.
In spoken conversation, a stand-in for scare quotes is a hand gesture known as "air quotes" or "finger quotes", which mimics quotation marks. A speaker may alternatively say "quote" before and "unquote" after quoted words, or say "quote unquote" before or after the quoted words, or pause before and emphasize the parts in quotes. These spoken methods are also used for literal and conventional quotes.