The term 'is forbidden to' can be expressed in three different ways using crossword solutions. The first solution is 'MAYNT' which is a contraction of 'may not'. This means that something is not allowed or prohibited. The second solution is 'MUSTNT' which is a contraction of 'must not'. This means that something is not allowed and is considered mandatory. The third solution is 'MAYNOT' which is a contraction of 'may not'. This means that something is not allowed or prohibited. All three solutions indicate that something is not allowed or prohibited.