This phrase means to stay in sync or aligned with a group or situation.  همگام ماندن یا همسو بودن با یک گروه یا موقعیت. 
مثال؛
During a dance performance, it’s important for all the dancers to keep in step with the music.  
 ...  [مشاهده متن کامل]  
In a military context, a drill sergeant might shout, “Soldiers, keep in step! We need to maintain a uniform march. ”
A team leader might say, “In order to achieve our goals, we need to keep in step with each other and work together. ”