Golshifteh Farahani Instagram – Sizdah beh dar. According to some Iranians’ belief the number thirteen is ominous. Sizdah Bedar, therefore, means “getting rid of the ominous of the day thirteen”. Going on a picnic in the heart of nature and natural places is one way to do so. According to the Dehkhoda Dictionary, “dar” means “valley and plain” and “be” means “towards”. Thus “Sizdah Bedar” means “towards the valley on the thirteenth day”.