Search Result：off one's guard
off one's guard 
(TTS Sound)
(TTS Sound)Overview of adj off_one's_guard
The adj off one's guard has 1 sense
- napping, off-guard, off guard, off one's guard, off his guard, off her guard, off your guard -- (not prepared or vigilant; "the blow caught him napping"; "caught in an off-guard moment"; "found him off his guard")