Definitions of lump:

• noun:   a large piece of something without definite shape

  Example: "A lump of coal"

• noun:   abnormal protuberance or localized enlargement
• noun:   a compact mass
• noun:   an awkward stupid person
• verb:   put together indiscriminately

  Example: "Lump together all the applicants"

• verb:   group or chunk together in a certain order or place side by side