The initial idioms of the letter C

Cataract Canyon	cataract surgery
catarrh	catarrhal fever
catarrhine	catarrhinian
Catasetum	Catasetum macrocarpum
catastrophe	catastrophic
catastrophic illness	catatonia
catatonic	catatonic schizophrenia
catatonic type schizophrenia	Catawba
catbird	catboat
catcall	catch
catch a glimpse	catch a wink
catch cold	catch crop
catch fire	catch on
catch one's breath	catch out
catch phrase	catch sight