Dictionary / Vocabulary / 見当がつく
けんとうがつく
to have a (rough) idea (of what the situation is)
Also written 見当が付く
詳しいことが全部わかるまでは、あわててその場にふみこむな。見当がつくまでは、慎重にかまえておれ。
Don't rush into the situation until you have all the details; hold your horses until you know where you are going.