Lexical Definition

‎רֶסֶן‎ reçen (reh'-sen) bridle ^H:N-M
from an unused root meaning to curb

bridle.

• a halter (as restraining)
• by implication, the jaw

1) something that restrains, halter, jaw
1a) halter
1a1) of restraint thrown off (fig)
1b) jaw (of crocodile)

See Greek: θώραξ · χαλινός

Brown-Driver-Briggs

I. ‎רֶ֫סֶן‎ noun masculine^{Isa 30:28}:

1. halter;

2. jaw (?); —

1. absolute ‎׳‎‎ר‎ Ps 32:9 restraining mouth of horse or ass (+‎מֶתֶג‎); figurative of ‎׳‎‎שֵׁם י‎, ‎עַללְֿחָיֵי עַמִּים‎‎׳‎‎ר‎ Isa 30:28 ‎מִפָּנַי שִׁלֵּ֑חוּ‎ ‎׳‎‎ר‎ Job 30:11, i.e. threw off restraint.

2. suffix ‎כֶּפֶל רִסְנוֺ‎ Job 41:5* the double of his jaw, his double jaws (of croc.), si vera 1.; connection of meanings strange, || ‎פְּנֵי לְבוּשׁוֺ‎, whence GHBW right Du conjecture ‎סִיֹנוֺ‎.

Brown-Driver-Briggs References