catch one off

(one's) guard Go to catch someone off guard.

Name	Pronounced	Usage
Herman	HUR-mən (English), HER-mahn (Dutch)	English, Dutch, Swedish, Norwegian, Danish, Slovene, Ancient Germanic
Alun	A-leen, A-lin	Welsh
Beverly	['bevəli]
Royal	['rɔiəl]
Ji-Eun	jee-uwn	Korean
WiesŁAw	VYE-swahf	Polish