It means "get". I like garlic, so I asked them to get this much garlic. Here's some examples, 記得拿傘。remember to bring your umbrella. 那小孩拿著玩具。the kid is holding a toy in his hand. 拿起來。Pick it up. The word 拿 is with the word element 手，手means hand. So the word is related to the action of hand. There are a lot of usage of 拿，you need to refer to the context of the sentence.

你的“拿”字，在这里是bring me sth./bring sth. foe me /take sth. to me有意思。 for example: “我的妈妈正在商店买衣服，我不想出门，我打电话让她拿些吃的回来。” "弟弟去学校忘了带书，让我拿去学校。“

谢谢Yikson!

你的“拿”字，在这里是offer（提供）或者 bring（把东西从其他人那里移动并归属于你的意思）