1. Not or no longer happening, functioning, or moving at the same time and pace as someone or something else; in an unsynchronized or uncoordinated manner (with someone or something). The soldiers got in trouble for being out of sync while marching.

What does it mean to unsynchronized?

: not operating or happening at the same time : not synchronized unsynchronized clocks unsynchronized movements.

What is called synchronization?

Synchronization is the coordination of events to operate a system in unison. For example, the conductor of an orchestra keeps the orchestra synchronized or in time. Systems that operate with all parts in synchrony are said to be synchronous or in sync—and those that are not are asynchronous.