n. A sly trick or device; as, an undercraft of authors. [ R. ] Sterne. [ 1913 Webster ]
n. [ Under + Prov. E. croft a vault; cf. OD. krochte crypt, and E. crypt. ] (Arch.) A subterranean room of any kind; esp., one under a church (see Crypt), or one used as a chapel or for any sacred purpose. [ 1913 Webster ]