To Doubt, To Suspect, To Be Suspicious Of
transitive verb, godan verb
The kanji means doubt, so this is just that as a verb. So this means to doubt, to suspect, or to be suspicious of.
うたがう
There's reason to doubt that you can teach an uni Tagalog (うたが), but once you try, it's actually not that hard. They're very good listeners after all.
なんで私ばかり疑うの？
Why do you only suspect me?
それは自分の目を疑うようなニュースでした。
It was a piece of news that would make you doubt your own eyes.
たまに、うちの犬の中には人間が入ってるんじゃないかなと疑うことがあります。
I sometimes suspect that our dog is actually a human on the inside.