Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
to feign ignorance; to pretend to be ignorant of; to play innocent; to brazen it out
ニクソンはオフィスに盗聴器をしかけておきながらシラを切ったので見付かった。Nixon was caught lying because he bugged his own office.
Also written しらを切る【しらをきる】、白を切る【しらをきる】