Tend means "be inclined", "feel willing or favorably disposed". She tends to believe I can get that job. The origin of the word is middle 14th century, from the Old French tendre. It isn't so much 'agree sometimes' as 'agree somewhat' - often with an undertone of reluctance to agree.

Would tend to meaning?

Apply one's attention, as in We should tend to our business, which is to teach youngsters. This term uses tend in the sense of “attend.” [ 1300s]

What does it mean when you tend to do something?

[intransitive] tend to do something to be likely to do something or to happen in a particular way because this is what often or usually happens.