"don" = to wear; (hence) to bear on the exterior.

[Jonathan Lighter]

This came up a couple of months ago. Here's another ex., from a professionally edited source:
 
Yesterday at http://www.livescience.com/animals/081126-turtle-shell.html:
 
"In an accompanying Nature article, researchers point to an alternative hypothesis for this partially-protected turtle. They suggest even earlier turtles donned a complete upper and lower shell."
 
JL




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