noun
dry firing a camera; clicking the shutter without film
Refers to pressing the shutter button when there is no film loaded, or to advance the film without taking a picture. A technical term from the film camera era.
フィルムを巻き上げるために空写しをする。
I dry fire the camera to advance the film.
空写しをしてしまって、大事な瞬間を撮り逃がした。
I accidentally dry fired and missed an important moment.