simple past tense and past participle of tell1.
all told, counting everyone or everything; in all: There were 50 guests all told.
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past tense of tell, from Old English talde, past tense of tellan (see tell (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
see all told; I told you so; little bird told me. also see under tell.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.