Etymology
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submerge (v.)

c. 1600 (transitive), from French submerger (14c.) or directly from Latin submergere "to plunge under, sink, overwhelm," from sub "under" (see sub-) + mergere "to plunge, immerse" (see merge). Intransitive meaning "sink under water, sink out of sight" is from 1650s, made common 20c. in connection with submarines. Related: Submerged; submerging.

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Definitions of submerge

submerge (v.)
sink below the surface; go under or as if under water;
Synonyms: submerse
submerge (v.)
cover completely or make imperceptible;
Synonyms: drown / overwhelm
submerge (v.)
put under water;
submerge your head completely
Synonyms: submerse
submerge (v.)
fill or cover completely, usually with water;
Synonyms: inundate / deluge
From wordnet.princeton.edu