落ち着けよ。
Words
落ち着く
(おちつく)
to calm down; to compose oneself; to regain presence of mind; to calm down; to settle down; to die down; to become stable; to abate; to settle down (in a location, job, etc.); to settle in; to be settled; to be fixed; to have been reached; to harmonize with; to harmonise with; to match; to suit; to fit; to be unobtrusive; to be quiet; to be subdued
よ
(よ)
indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!