Where does “underbook” come from?

underbook (English) comes from English under-, from English under, from Middle English under, from Old English under, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

underbook (English): To fail to book enough of something; not to sell...

Definitions

To fail to book enough of something; not to sell...

Ancestry of “underbook”, step by step

Step	Language	Word	Meaning
1	English	under-	Beneath, under
2	English	under	In or at a lower level than; As a subject of;...
3	Middle English	under	under
4	Old English	under	under, beneath
5	Proto-Germanic	under	among, between; under, beneath; under
6	Proto-Indo-European	h₁entér	between
7	Proto-Indo-European	h₁en	in; in, inside

Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →