The phrase "pick the litter" is often associated with cleaning up trash or debris. However, there are many synonyms for this phrase that can add variety to your vocabulary. "Clean up" is a straightforward replacement that can be used in most cases. "Clear away" is another option that can give a sense of organization, while "tidy up" implies a neatening or straightening of a space. "Sweep up" is a good choice for areas with loose or small debris, while "scour" adds a sense of thoroughness. Overall, there are many different synonyms for "pick the litter" that can convey different levels of urgency and specificity.