שִׁלְשֹׁם (šilšōm) is
a Hebrew noun
meaning three days ago. It appears
25 times
in 10 books of the Hebrew Bible
(Strong's H8032).
Same Hebrew root (TWOT 2403c)
Range of meaning (TWOT 2403c)three days ago, day before yesterday; trebly; before, beforetime, excellent things, heretofore, three days, time past
Full entry: Brown-Driver-Briggs and Strong's
שִׁלְשֹׁםadverb: three days ago, day before yesterday
and (less often) שִׁלְשׁוֹם 25 adverb = three days ago, specifically day before yesterday
Strong's H8032שִׁלְשׁוֹם: trebly, i.e. (in time) day before yesterday KJV:before (that time, -time), excellent things (from the margin), heretofore, three days, time past.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 2403: שָׁלַשׁšālaš — do a third time, divide into three parts; three years old; be, make, triplicate; do the third time, three, threefold