Expressions (phrases, clauses, etc.)
(not) anyone; (not) a single person; no one; nobody
with neg. verb
誰一人、自分が間違っていることを認めようとしなかったので、議論は延々と続いた。The argument lasted a long time because nobody would admit to being in the wrong.
Also written 誰ひとり【だれひとり】、だれ一人【だれひとり】