To go under or as if under water. (verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "submerge" in a sentence
"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."
"Because place is such a major part of my writing and life, I thought it important that Bird Cloud breathe in and out of the landscape, a house subject not only to the wind, but to the drowning shadows that submerge it every evening and the sharp slice of sunlight at the eastern end of the cliff."
"Today we merge Washington's birthday with the birthdays of other presidents and submerge them all in clothing and appliance sales."