*bṭḥ - to be confident, at rest (Kogan 2015:486)

Hebrew

bṭḥ - to be confident (HALOT 120)

Jewish Babylonian Aramaic

bṭḥ - to be confident (DJBA 196)

Is rightly considered a Hebraism in DJBA 196.

Arabic

bṭḥ - to spread, to expand, to extend; to throw somebody down upon his face; VII. to lie, to stretch oneself (Lane 216)

May be remotely related.

Jibbali

béṭaḥ - to throw down on the belly (JL 30)

May be remotely related.