Definitions of shadow:

• noun:   refuge from danger or observation

  Example: "He felt secure in his father's shadow"

• noun:   a premonition of something adverse

  Example: "A shadow over his happiness"

• noun:   an inseparable companion

  Example: "The poor child was his mother's shadow"

• noun:   a dominating and pervasive presence

  Example: "He received little recognition working in the shadow of his father"

• noun:   shade within clear boundaries
• noun:   a spy employed to follow someone and report their movements
• noun:   an unilluminated area
• noun:   an indication that something has been present
• noun:   something existing in perception only
• verb:   make appear small by comparison
• verb:   cast a shadow over
• verb:   follow, usually without the person's knowledge

  Example: "The police are shadowing her"

• name:  A surname (very rare: popularity rank in the U.S.: #54282)