3N-SING (地毯或天鹅绒等表面的)绒毛 The nap of a carpet or of a cloth such as velvet is the top layer of short threads, which usually lie smoothly in one direction. (地毯或天鹅绒等表面的)绒毛
4PHRASE 被弄得措手不及;猝不及防 If someone is caught napping, something happens when they are not prepared for it, although they should have been. 被弄得措手不及;猝不及防 [informal]
The security services were clearly caught napping.