1. (adj) hole-and-corner, hole-in-corner
relating to the peripheral and unimportant aspects of life
"a hole-and-corner life in some obscure community"- H.G.Wells
2. (adj) clandestine, cloak-and-dagger, hole-and-corner(a), hugger-mugger, hush-hush, secret, surreptitious, undercover, underground
conducted with or marked by hidden aims or methods
"clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"
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Definitions of hole-and-corner 
