Where does “עכת״ד” come from?

עכת״ד (Hebrew) comes from Hebrew עד כאן תוכן דבריו — until here content of his words.

Ancestry of “עכת״ד”, step by step

Step	Language	Word	Meaning
1	Hebrew	עד כאן תוכן דבריו	until here content of his words

עכת״ד — Etymology, Origin & Word History | Etymology Explorer