This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To place under water.

v. To cover with water; inundate.

v. To hide from view; obscure.

verb-intransitive. To go under or as if under water.

v. To sink out of sight.

v. To put into a liquid; to immerse; to plunge into and keep in.

v. To be engulfed in or with something.

v. To put under water; to plunge.

v. To cover or overflow with water; to inundate; to flood; to drown.

verb-intransitive. To plunge into water or other fluid; to be buried or covered, as by a fluid; to be merged; hence, to be completely included.

To put under water; plunge.

To cover or overflow with water; inundate; drown.

To sink under water; be buried or covered, as by a fluid; sink out of sight.

v. sink below the surface; go under or as if under water

v. put under water

v. cover completely or make imperceptible

v. fill or cover completely, usually with water

"Way back in 1966, when he first began assuming leadership of the organization he'd come to re-brand as the Family, he sent out a memo declaring that the time had come to "submerge" the group's public profile."

submerged    submerges    submerging   

plunge    immerse    cover    spread over    flood   

sink    submerged bog    submerged pump   

submergence    submersion   

inundate    flood    drown    sink    submerse    immerse   

converge    dirge    diverge    emerge    merge    purge    reemerge    scourge    serge    splurge   

quake-spawned    quantumcascade    ever-shrinking    thirty-yard    steel-frame    ten-degree    hermeneutical    mill-power    catchment    writerly