overdo / overdue are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
overdo: (verb) do something to an excessive degree.
overdue: NA
overdo: OW·v·er·d·UW
overdue: OW·v·er·d·UW
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)