Quick Definition
I break in pieces, crush, thoroughly weaken
Strong's Definition
to crush together, i.e. (figuratively) to dispirit
Derivation: from G4862 (σύν) and (to crumble);
KJV Usage: break
Thayer's Greek Lexicon
συνθρυπτο, participle nominative plural masculine συνθρύπτοντές; to break in pieces, to crush: metaphorically, τήν καρδίαν, to break one's heart, i. e. to deprive of strength and courage, dispirit, incapacitate for enduring trials, Act_21:13. (In ecclesiastical and Byzantine writings.)
Mounce Concise Greek Dictionary
συνθρύπτω synthryptō 1x
to crush to pieces; met. to break the heart of any one, to make to recoil in fear, Act_21:13
Abbott-Smith Greek Lexicon
*† συν -θρύπτω ,
to break in pieces, crush: metaph ., τ . καρδίαν , Act_21:13 .†
Moulton & Milligan — Vocabulary of the Greek NT
συνθρύπτω [page 607]
According to Hobart p. 249 θρύπτω is a medical term for the crushing of a calculus, and he thinks that the comp d . may have been similarly employed, and, in pursuance of his theme, points out that it is peculiar to Luke ( Act_21:13 ) among Greek authors. But LS .8 cite at least one other passage, Theod. Prodr. 4. 325 συνεθρύβη . For the simplex θρύπτω see P Oxy III. 471 .80 (ii/A.D.) εὔμορφον καὶ πλούσιον μειράκιον ἐθρύπτετο , where the editors render, this handsome and rich youth gave himself airs.
Liddell-Scott — Intermediate Greek Lexicon
συνθρύπτω fut. ψω "to break in pieces: to crush", NTest.
STEPBible — Tyndale Abridged Greek Lexicon
συν-θρύπτω
to break in pieces, crush: metaphorically, τ. καρδίαν, Act.21:13.†
(AS)