עַכְשׁוּב Achshuv
Every verse in which this word stands — 1 place, in canonical order, first appearance to last. These are the places the lexicon carries under this word's own entry, counting every form the text writes it in, which is the number on the list.
Once, in Tehillim 140:4 — 'the venom of the achshuv is under their lips.' Asp, adder or spider; the identification is discussed.
שָֽׁנֲנוּ לְשׁוֹנָם כְּֽמוֹ־נָחָשׁ חֲמַת עַכְשׁוּב תַּחַת שְׂפָתֵימוֹ סֶֽלָה
They have sharpened their tongue like a serpent; Vipers' venom is under their lips. Selah
Quick answers
What is the Hebrew word for achshuv?
Achshuv in Hebrew is עכשוב, with a gematria of 398 in the standard method.
How many times is the achshuv mentioned in the Tanakh?
The word stands 1 time in the Tanakh, first at Psalms 140:4.
A spelling is not a word. The bare letters עכשוב stand 1 time in the corpus, which is a different question and often a different number: the same letters can spell a name or another word entirely, and the creature written with a particle attached is a spelling that search never returns. It is here, as itself.
See the one occurrence of the spelling עכשוב →