What is the X in X-mas?
early 14c., wrappen, of uncertain etymology, perhaps via Scandinavian (cf. Danish dialectal vravle "to wind"), ultimately from PIE *werp- "to turn, wind" (cf. Greek rhaptein "to sew"), from root *wer- (3) "to turn, bend" (see versus). Related: Wrapped; wrapping.
late 15c., "fine cloth used as a cover or wrapping for bread," from wrap (v.). As a type of women's garment, recorded from 1827. Meaning "end of a filming session" is attested from 1974. Figurative phrase under wraps "in concealment" is recorded from 1939.
: Well, it's a wrap on the squashverb
To complete; finish; wrap up: Filming, based on Bob Randall's 1977 thriller, wrapped last summer/ Because when it wraps, they strike the sets and you're stuck (1970s+ Movies and television)
[possibly fr the shrouding of a corpse]
Something very successful and impressive; a sensation; wow1: It would make a wowser of a movie/ The four-beat peroration is a wowser
[1928+; fr wow, perhaps influenced by rouser]