The term 'be on both sides of' can be expressed in two words: STRADDLE and FLANK. STRADDLE means to sit or stand with one leg on each side of something, while FLANK means to be situated on either side of something. Both terms refer to the idea of being on both sides of an object or situation. Straddling and flanking are often used in military tactics, where troops are positioned on both sides of a target in order to surround it. In other contexts, the terms can also be used to describe a person's attitude towards a particular issue, where they may take a stance that is on both sides of the argument.