....주세요 means 'please give me....'. 주세요 is the polite formal conjugation of the verb 주다 [to give] and is pronounced ju-se-yo. Example 반찬 좀 주세요. = Please give me some side dishes. 레몬에이드 주세요. = Please give me some lemonade. You can use it when you want to ask someone to hand something to you, when ordering in a restaurant, when asking for an item in a shop or to ask someone to do something for you.