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to threaten; to menace; to intimidate
to startle; to frighten; to scare
弟を後ろから嚇かして怒られた。
I got scolded for scaring my younger brother from behind.
友達を嚇かすつもりが自分が驚いた。
I meant to scare my friend but ended up startling myself.
上級生が下級生を大声で嚇かした。
The upperclassman intimidated the younger student by shouting.