tsa.mad describes joining oneself to Baal of Peor, joining deceit, or something fastened in place.

The attested uses most often describe people joining themselves to Baal of Peor; another occurrence describes a tongue joined to deceit, while a passive participle describes a sword fastened at a waist.

1. Joining oneself in a stated relation · dominant

   In Numbers 25:3 and Numbers 25:5, Niphal forms occur in clauses about Israel and certain men in relation to Baal of Peor; the APB renders these clauses “Israel yoked itself to Baal of Peor” and “who have yoked themselves to Baal of Peor.” Psalm 106:28 likewise has a Niphal form, and the APB renders “They joined themselves to Baal of Peor”; Psalm 50:19 has a Hiphil imperfect in the clause about a tongue and deceit, rendered “your tongue has joined itself to deceit.”

   Numbers 25:3Numbers 25:5Psalm 106:28Psalm 50:19
2. Being fastened to clothing · rare

   In 2 Samuel 20:8, a Pual passive participle modifies the sword in the description of Joab's belt and sheath; the APB renders the sword as “fastened at his waist in its sheath.”

   2 Samuel 20:8

In the Anselm Project Bible: The APB varies between “yoked itself,” “yoked themselves,” “joined themselves,” “joined itself,” and “fastened.” Because it is a whole-verse translation, these renderings show the clauses' presentation rather than fixed English equivalents.