1. to secretly plan together to commit an unlawful or harmful act
2. to act together as if by design; to combine in bringing about a particular result

Examples

• The rebels conspired to overthrow the government.
• Three employees conspired to steal company funds.
• Bad weather and traffic delays conspired to ruin our vacation plans.
• Several factors conspired to make the project successful.
• The criminals conspired in secret for months before the heist.
• Events seemed to conspire against us that day.
• The students conspired to surprise their teacher with a party.