1. come between   LAMPOON   LAMENT   FACILITATE   INTERVENE   Hint Half-n-half Clue   2. lose vitality   IMPLEMENT   INDUCE   LANGUISH   IMPUTE   Half-n-half Clue   3. reverse   LINGER   GRATIFY   INDUCE   INVERT   Half-n-half Clue   4. attribute to someone   IMPUTE   IMPAIR   FACILITATE   INTERVENE   Half-n-half Clue   5. grieve   LAMENT   IMPUTE   LANGUISH   FACILITATE   Half-n-half Clue   6. obstruct   HAMPER   INDUCE   IMPLEMENT   FATHOM   Half-n-half Clue   7. accuse   INTIMIDATE   INDICT   INDUCE   LANGUISH   Half-n-half Clue