A lot vs. Alot: 9 Grammatical Pitfalls
c.1600, from Latin submergere "to plunge under, sink, overwhelm," from sub "under" (see sub-) + mergere "to plunge, immerse" (see merge). Intransitive use is from 1650s, made common 20c. in connection with submarines. Related: Submerged; submerging.