How can I show a character doing a doubletake?
You can just say it:
John did a double-take.
Or you can describe it (and there are probably dozens of ways to do that). Some rough examples:
He looked, and looked again, longer this time.
He looked once, then twice.
His gaze slid past her, then jerked back, riveted.
A lot's going to depend on whether the POV character is the one doing the double-take, or if someone else is observing it.
You can just say it:
John did a double-take.
Or you can describe it (and there are probably dozens of ways to do that). Some rough examples:
He looked, and looked again, longer this time.
He looked once, then twice.
His gaze slid past her, then jerked back, riveted.
A lot's going to depend on whether the POV character is the one doing the double-take, or if someone else is observing it.
In my humble opinion I would only interpret a double-take as a double-take if it's simply called a double-take.
[snip]
There's only one movement for a 'double-take'and most folk know instantly what 'did a double-take' is.
I agree, in contemporary novels. But can I still use this very modern sounding idiom in a novel set in ancient Egypt? Hmm...
Teresa snorted into her coffee. I passed a napkin over. She wiped her face and looked over at me. "Should I?"
In my humble opinion I would only interpret a double-take as a double-take if it's simply called a double-take.
These example descriptions of eye or head movement merely suggest to me the understanding/meaning of what was said or done took a little time to sink in or was being slowly registered or wasn't fully believed or.....
Could you do it in dialogue?
"Well, I suppose - wait, what?"
"He did a double take" assumes that all double takes are created equal. They aren't. Consider the following: http://youtu.be/-dTHaMOz4wsThat attempt at dialogue definition of a double-take doesn't create a double-take image for me.
A dictionary definition is one thing. An attempt to describe it is another and so is folk's perception of what one thinks one has described.
Sometimes, simple is best.