A primitive root (rather by transposition for bahal); to palpitate; hence, (causatively) to terrify -- trouble.
see HEBREW bahal
H1089. balah
[בָּלַהּ] verb trouble (Aramaic , compare Arabic be weak in intellect; see also בהל — only
Pi`el Participle לִבְנוֺת אותם מְבַלֲהִים Kt (Qr מְבַהֲלִים needless) Ezra 4:4 troubled them in building.