Definitions of heaving:

• noun:   throwing something heavy (with great effort)

  Example: "He was not good at heaving passes"

• noun:   the act of lifting something with great effort
• noun:   breathing heavily (as after exertion)
• noun:   an upward movement (especially a rhythmical rising and falling)

  Example: "The heaving of waves on a rough sea"

• adjective:   rising and falling alternately as in waves

  Example: "The heaving waves in the storm-tossed sea"