holh (n.) "hollow place, hole", from Proto Germanic
*holhwo-, related to hol "hole" (see hole). The noun sense of "lowland, valley, basin" is 1553. The verb is from Middle English
holowen. The figurative sense of "insincere" is attested from 1529. To carry it hollow "take it completely" is first recorded 1668, of unknown origin or connection.