{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.
FOR ONE THING
Meaning of FOR ONE THING in English
Dictionary of English idioms . Словарь английских идиом. 2012