When it is time to stop working or engaging in an activity, one can use expression "call it a day/night". However, there are several synonyms that can be used to convey the same meaning. For instance, one can say "wrap it up", "pack it in", or "finish up" to indicate the end of an activity. Another possible expression is "cut it short" which implies that the activity is being stopped earlier than planned. "Fold up" and "close up shop" are also common phrases which mean it's time to leave and stop working. In essence, these synonyms provide alternative ways of expressing the end of an activity at the appropriate time.