Having seen much; hence, accomplished, experienced.(adjective)
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Use "well-seen" in a sentence
"This is well-seen, but there are some who say they hold the key."
"But Johns was infatuated with popular culture, and he wanted to find images which, as he put it, were so well-known that they were not well-seen: flags, targets, stuff like that."
"Boer woman, mind you, and no liar; the young wife of an upright and well-seen Burgher, who had his farm an easy four hours from here."