1. counted too many of something; included more items in a count than actually exist
Usage: past tense and past participle of overcount

Examples

• The election officials overcounted the ballots in that district.
• She overcounted the inventory and ordered too many supplies.
• The census workers overcounted the population by including duplicate entries.
• He overcounted the votes and had to recount them manually.
• The store manager overcounted the cash register receipts.
• They overcounted the attendance at the event by 200 people.