for one thing,...

for one thing

As one example or reason (out of several potential ones). Why don't I like musicals? Well, for one thing, I just can't take a story seriously when it's set to music. I prefer shopping at brick-and-mortar shops. It's nice talking to someone in person, for one thing.
See also: one, thing
Farlex Dictionary of Idioms.

for ˈone thing, ...(, and for aˈnother, ...)

one reason is..., and another reason is...: You ought to stop smoking, you know. For one thing, you’re damaging your health, and for another, you can’t afford it! ‘Why don’t you get a car?’ ‘Well for one thing, I can’t drive!’
See also: one
Farlex Partner Idioms Dictionary
See also:
  • drive (one) out of office
  • force (one) out of office
  • force out of office
  • give (one) (one's) head
  • give head
  • give somebody their head
  • give someone their head
  • cooking for one
  • as one door closes, another (one) opens
  • as one door closes, another one opens