Is it ensure, insure, or assure?
c.1300, from Old English geond (see yond) + comp. suffix -er (2). Now replaced except in poetic usage by ungrammatical that.
A rural person; a bumpkin; hayseed, hick
[1812+; perhaps fr a dialect name for a woodpecker, hence semantically similar to British dialect gowk, ''cuckoo, simpleton'']