At arm’s length

At arm’s length: à distância, distância razoável que impede um contato mais direto (entre pessoas que estão negociando algo, por ex), numa distância que evita uma conexão ou contato mais direto

Keep (someone, something) at arm’s length: manter (algo ou alguém) à distância

“We proposed a tax break for companies that treat their workers well, but lawmakers are keeping the idea at arm's length for now.

“She doesn't talk much about it because she needs to hold these painful experiences at arm's length.” (www.thefreedictionary.com)