what with idiom informal
C2 （尤指糟糕或困难的局面）因为，由于
used to talk about the reasons for a particular situation, especially a bad or difficult situation
I'm very tired, what with travelling all day yesterday and having a disturbed night. 我非常累，因为昨天旅行了一整天，而且晚上又被吵得没睡好。