What does 気になりだす mean?


I found this sentence:

だが変だなあと気になりだした。

I got the meaning of the first part, but I don't get the exact meaning of
気になりだした.




I think it comes from 気になる which means to worry. In Japanese it is common to
combine two verbs to form a new one. 着る(to wear) + 替える(to switch/replace) =
着替える(to change clothes). The preceding verb must be changed to the verb stem
before being attached to the other verb. 気になる = 気になり. Then the verb だす is
attached. If it's correct then it should mean... To start worrying. I'm still
learning so I cannot guarantee my validity.




I think it comes from 気になる which means to worry. In Japanese it is common to
combine two verbs to form a new one. 着る(to wear) + 替える(to switch/replace) =
着替える(to change clothes). The preceding verb must be changed to the verb stem
before being attached to the other verb. 気になる = 気になり. Then the verb だす is
attached. If it's correct then it should mean... To start worrying. I'm still
learning so I cannot guarantee my validity.

