for one thing
used to introduce a reason for something:
"Why won't you come to New York with me?" "For one thing, I don't like flying, and for another, I can't afford it."

[TahlilGaran] Advanced Learner's Dictionary ▲

for one thing
one reason is.
For one thing, sun screens block more of the sun's damaging rays, so they are much more effective.

I like smaller companies — they're more personal for one thing.

[TahlilGaran] English Idioms Dictionary ▲

for one thing
for one reason (among others)
"It is not possible to use the old building. For one thing it will not pass a fire inspection."

[TahlilGaran] English Idioms Dictionary ▲

for one thing
adv. phr. As one thing of several; as one in a list of things.
The teacher said, "You get a low mark, for one thing, because you did not do your homework."
The house was poorly built; for one thing, the roof leaked.
Compare: FOR EXAMPLE, IN THE FIRST PLACE.

[TahlilGaran] English Idioms Dictionary ▲