From sun and trecho (including its alternate); to rush together (hastily assemble) or headlong (figuratively) -- run (together, with).
see GREEK sun
see GREEK trecho
1. to run together: of the gathering of a multitude of people, ἐκεῖ, Mark 6:33; πρός τινα, Acts 3:11.
2. to run along with others; metaphorically, to rush with i. e. cast oneself, plunge, 1 Peter 4:4. (Compare: ἐπισυντρέχω.)