A one-for-one deal is an agreement between two parties in which each party gives up something of equal value in exchange for the other's item. In this case, the crossword solutions for the term 'one-for-one deal' are 'SWAP' and 'tradeoff'. A SWAP is a mutual exchange of goods or services, while a tradeoff is a situation in which one thing is given up in order to gain something else. Both terms refer to the concept of exchanging something of equal value in a one-for-one deal.