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頭から

from one's head; headfirst

→ 頭
phrase Uncommon #17,800
from one's head; headfirst In expressions like 頭から離れない, it means that something cannot be forgotten or stops occupying one's thoughts. With movement verbs such as 飛び込む, it means headfirst.
JA: そのメロディーが頭から離れない。
EN: I can't get that melody out of my head.

私たちは彼の話を頭から信用した。

We took his word for it from the start.

頭から彼のことが離れないの。

I can't get him out of my head.

私は川に頭から飛び込んだ。

I dove headfirst into the river.

彼は頭から川に落ちた。

He fell headfirst into the river.

彼の言うことなんて、頭から信じてないの。

I don't believe a word he says.