Verb
define clearly
attach with or as if with a pin
place in a confining or embarrassing position
Source: WordNetI don't know how many thoughts we have a second, but it's quite an amazing number, and just to pin down the appropriate sequence of those, all you really need is a pencil and a piece of paper. Robert Wyatt
If there are going to be people out there making war on other people, don't you think it's a good idea for some of those people to at least follow a code of ethics? Not 'honor' but something you can pin down and be sure of, something with the same rules for everybody. Mercedes Lackey
I didn't have a financial need, and I wasn't very gifted at relationships. I probably was more like what we think of boys as being: hard to pin down and wary of commitment. Candice Bergen
I'm hard to pin down. I tend to look different in films. Joan Allen
I've always been interested in how fast-moving our identity is and that I've never been able to pin down who I truly am. That inspires me to write, because I feel like that cements me a bit, in that I find my identity in being an artist. Marina and the Diamonds
Consciousness can be startlingly intense. It is the most vivid of phenomena; nothing is more real to us. But it can be frustratingly diaphanous: in talking about conscious experience, it is notoriously difficult to pin down the subject matter. David Chalmers