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To Compensate For
transitive verb, ichidan verb
埋める is "to bury." 合わせる is "to unify together." If you bury somebody in order to unify them with you, you're almost certainly trying to compensate for something.
The readings come from 埋める and 合わせる. Combine them into one big happy word.
Can’t we make up for this loss in some way or another?