on one's head

Prepositional phrase

Assumed or borne, as a responsibility or something blameworthy. / Assigned by government authorities as a bounty or penalty.

Japanese Meaning

（責任や非難すべき事柄など）を引き受ける、または担う状態を示す / 政府当局によって、賞金や罰金などが課せられた状態を表す

When you accept the role of team leader, the ultimate responsibility falls on one's head.

チームリーダーの役割を引き受けると、最終的な責任は自分の肩にのしかかります。

Sense（1）

Assumed or borne, as a responsibility or something blameworthy.

Sense（2）

Assigned by government authorities as a bounty or penalty.