Definitions of worry:

• noun:   a strong feeling of anxiety

  Example: "His worry over the prospect of being fired"

• noun:   something or someone that causes anxiety; a source of unhappiness

  Example: "It's a major worry"

• verb:   touch or rub constantly
• verb:   lacerate by biting
• verb:   disturb the peace of mind of; afflict with mental agitation or distress

  Example: "I cannot sleep--my daughter's health is worrying me"

• verb:   be concerned with

  Example: "I worry about my grades"

• verb:   be worried, concerned, anxious, troubled, or uneasy

  Example: "I worry about my job"

• verb:   be on the mind of

  Example: "I worry about the second Germanic consonant"