UM
    
Meaning of UM in English
	
n.
Pronunciation: a prolonged m sound, ə m
 Function: interjection
 Date: 1672
― used to indicate hesitation <well, um , I don't know>
	
	
	Merriam Webster Collegiate English Dictionary.
    	Merriam Webster - Энциклопедический словарь английского языка.
	2012