From Longman Dictionary of Contemporary Englishfor one thingfor one thingBECAUSEused to introduce a reason for what you have just saidHe couldn’t bring himself to say what he thought. For one thing, she seldom stopped to listen. For another, he doubted that he could make himself clear. →one
for one thing• Their love of wine leads to raised levels of alcoholism, for one thing, which balances out the supposed benefits.• He was responsible for Loredana's death, for one thing.• A higher body count score, for one thing.• The ex-steelworkers, for one thing, have not gone away.• Well, for one thing she takes her readers and our intellect seriously.• Well, for one thing, women have a different experience in life.