Yours, Etc.: Origins and Uses of 8 Sign-Offs
1570s, "beat back, drive back, force back," from Latin reverberatus, past participle of reverberare "strike back, repel, cause to rebound" (see reverberation). Meaning "re-echo" is from 1590s. Earlier verb was reverberen (early 15c.). Related: Reverberated; reverberating.