Acts 7:54

Ἀκούοντες δὲ ταῦτα, διεπρίοντο ταῖς καρδίαις αὐτῶν, καὶ ἔβρυχον τοὺς ὀδόντας ἐπ᾽ αὐτόν.

RBT Greek Interlinear:

Strongs 191; Akouontes; Ἀκούοντες; those who are hearing; V-PPA-NMP

Strongs 1161; de; δὲ; and; Conj

Strongs 3778; tauta; ταῦτα; these ones; DPro-ANP

Strongs 1282; dieprionto; διεπρίοντο; sawn asunder; V-IIM/P-3P

Strongs 3588; tais; ταῖς; the; Art-DFP

Strongs 2588; kardiais; καρδίαις; hearts; N-DFP

Strongs 846; autōn; αὐτῶν; of themselves; PPro-GM3P

Strongs 2532; kai; καὶ; and; Conj

Strongs 1031; ebrychon; ἔβρυχον; were chomping; V-IIA-3P

Strongs 3588; tous; τοὺς; the; Art-AMP

Strongs 3599; odontas; ὀδόντας; teeth; N-AMP

Strongs 1909; ep’; ἐπ’; upon; Prep

Strongs 846; auton; αὐτόν; himself; PPro-AM3S

RBT Translation:

And those who are hearing these things, the Hearts of themselves kept being sawn asunder, and they kept chomping the Teeth upon himself.

βρυχό - to chomp

γνάθος ἱππείη βρύκει — “the horse’s jaw chomps” (Hom. Epigr. 14.13).
βρύκειν ἑφθὰ καὶ ὀπτὰ [κρέα] = “gnaw cooked meat” (E. Cyc. 358).
πρὸς ταῦτα βρύκετʼ = “chomping at these things” (Aristoph. Pax 1315).

(cf. LSJ βρυχό)

Julia Smith Literal 1876 Translation:
And having heard those, they were sawn through their hearts, and they gnashed the teeth upon him.

LITV Translation:
And hearing these things, they were cut to their hearts and gnashed the teeth on him.