Someone in partnership with another was "in" these, probably from the French for "hut"
If you've ever 
heard someone trying to impersonate a Frenchman, you've probably heard ... hut'
, which from as early as 1791 was used by peasants as a vulgar way of ... 
Another alternative is that it is the fusion of words 'zest' and 'flte, two... [DOC] [TLE] Neanderthals built mysterious cave structures 175,000 years ago ... [PAR] May 25, 2016 ... Constructions discovered deep in a French cave rank among the earliest ... on 
top of one another to produce rudimentary walls on the damp cave floor.