יָאַשׁ (b. h.; cmp. אִישׁ a. יֵשׁ) [to exist, be strong.]
    Pi. - יֵאֵשׁ (privat., cmp. דִּשֵּׁן) to consider undone, to give up; v. יֵאוּשׁ.
    Hithpa. - הִתְיָאֵשׁ, הִתְיָי׳ ; Nithpa. נִתְיָאֵשׁ, נִתְיָי׳ 1) to lose energy, relax. Y. Ber. IX, end, 14ᵈ שנִתְיָאֲשׁוּ ידיהם וכ׳ whose hands have grown lax concerning the Law (who do not care to uphold the Law; Midr. Till. to Ps. CXIX, 126 רפו ידיהם). —2) (with מן) to give up hope, to discard from the mind. Ab. I, 7 אל תִּתְיָאֵשׁ וכ׳ do not give up the idea of divine retribution (when you see sinners prosper).—Esp. (of lost things) to despair of recovery, to resign possession (by which the finder acquires the right of keeping what he has found, and the robber obtains possession of the stolen object and must make restoration in value). B. Kam. 68ᵇ, a. e. גזל ולא נִתְיָיאֲשׁוּ הבעלים if one has robbed, and the owner has not yet given the hope of recovery. B. Mets. 21ᵇ מפני שהבעלים מִתְיָאֲשִׁין מהן because the owners (who dropped the coins) have given them up; a. v. fr.