*obreption*

n. [ L. obreptio, fr. obrepere, obreptum, to creep up to; ob (see Ob-) + repere to creep. ] 1. The act of creeping upon with secrecy or by surprise. [ Obs. ] Cudworth. [ 1913 Webster ]

2. (Scots Law) The obtaining gifts of escheat by fraud or surprise. Bell. [ 1913 Webster ]