Pickmeans ‘remove small pieces of something from something else, usually with your hands’:
Let’s go into the garden andpicksome flowers for the dinner table.
Not: …pick up some flowers…
She earned money during the summerpickingfruit on local farms.
Pickcan also mean ‘choose’:
Have a look at these photos of the walking trip.Pickthe ones you want and give me back the rest.
Pick upmeans ‘lift something up using your hands’:
I’m tired ofpicking upyour clothes from the floor! Can’t you hang them up properly in the wardrobe?
We can also usepick upto mean ‘go to a place and bring something or someone back’:
Let me know what time your flight arrives. I canpickyouupat the airport and take you to your hotel.
You will find other meanings ofpickandpick upin a good learner’s dictionary.