To conspire means to secretly plan with others to do something wrong or harmful. When people conspire, they work together in hidden ways, plotting their actions so no one else knows what they're up to.

In history, groups have conspired to overthrow governments, steal treasures, or commit crimes. In a lighter sense, friends might conspire to throw a surprise party, working together secretly to keep it hidden. Your siblings might conspire to convince your parents to get a puppy, coordinating their arguments and timing.

The word carries a sense of secrecy and coordination. One person alone doesn't conspire: a conspiracy requires multiple people working together toward a shared goal they want to keep hidden. When people get caught conspiring to cheat on a test or break an important rule, they face consequences not just for the act itself but for the deceptive planning that went into it.

Sometimes people joke that events are conspiring against them when several unlucky things happen at once, like waking up late, missing the bus, and forgetting their homework all on the same morning. This playful use suggests that even random bad luck can feel like an organized plot.