To 'pull some strings' means to exert influence over a situation or decision by taking advantage of connections or power in order to gain advantage unofficially or unfairly. This expression comes from the image of a puppeteer manipulating a marionette by literally pulling strings. If someone says 'I'll try to pull some strings' they mean they will try to help the situation from the inside.

1. Don't worry about it. My Dad will pull some strings in work and he'll get you the job.
2. I got my place in college. My Uncle made a big donation and he pulled some strings for me.
3. I don't think it's fair that you single me out. Sounds like someone else is pulling your strings!

1. I was wondering if you might be able to pull some strings and organise a meeting between the head of the department and I?
2. We don't usually offer a discount on this particular package but I'll see if I can pull some strings taking into consideration your loyalty to us over the past number of years.