Most researchers and medical professionals believe that MS is an immune-mediated disease. This means that the bodyâs immune system attacks healthy nerve tissue, which results in nerve damage that affects the whole body. Immune system activity seems to result in the inflammation responsible for many MS symptoms.
arm's-length transaction. Basis of determining fair market value (FMV) , it is a dealing between independent, unrelated, and well informed parties looking out for their individual interests. Transactions involving family members, and parent companies and subsidiaries, are deemed arm-in-arm dealings. To qualify as an arm's length transaction, neither of the involved parties may have any interest in the transaction's consequences to the other party.
keep at arm's length from someone or something. Fig. to retain a degree of physical or social remoteness from someone or something.I try to keep at arm's length from Larry, since our disagreement. I keep Tom at arm's length because we don't get along. keep someone or something around. 2  keep someone or something at arm's length. 3  keep someone or something at bay. 4  keep someone or something hanging. 5  keep someone or something off.