turn on its head

Verb

idiomatic transitive

(transitive, idiomatic) To turn upside-down; to invert. / (transitive, idiomatic) To completely change.

Japanese Meaning

ひっくり返す、逆さまにする / 徹底的に変える、完全に逆転させる

The new study may turn on its head decades of accepted theory.

その新しい研究は長年受け入れられてきた理論を根底から覆すかもしれない。

Sense（1）

(transitive, idiomatic) To turn upside-down; to invert.

The crisis turned the formulas that had seemed to work on their head.

Sense（2）

(transitive, idiomatic) To completely change.

The global economic crisis has managed to turn stock exchanges worldwide on their head.

turns on its head

（ present singular third-person ）

turning on its head

（ participle present ）

turned on its head

（ participle past ）

turned on its head

（ past ）