The term 'OPENS WIDE' can be summarized by two crossword solutions: GAPES (5 letters) and YAWNS (5 letters). GAPES is an expression of surprise or astonishment, often accompanied by a wide opening of the mouth. YAWNS are a reflex action that occurs when a person is tired, bored, or stressed, and involves a deep inhalation of air followed by a wide opening of the mouth. Both expressions involve the opening of the mouth wide, hence the term 'OPENS WIDE'.