The term 'not to be repeated' can be expressed in four different ways using crossword solutions. The first solution is 'ONCE', which is a four letter word meaning 'at one time and no more'. The second solution is 'oneshot', which is a seven letter word meaning 'done or made only ONCE'. The third solution is 'ONETIME', which is also a seven letter word meaning 'occurring or done only ONCE'. The fourth solution is 'neveragain', which is a ten letter word meaning 'not ever again'. All of these solutions express the idea that something should not be repeated.