σιγᾶν
From LSJ
To χάρις ὑμῖν οὕτω τίθησιν κτλ. → Thus he writes joy to you all, etc. (Cramer's Catena on 1 Thessalonians 1.1)
Greek > English (Woodhouse Verbs Reversed)
(see also σιγάζω): be hushed, be reticent about, be silent, hold one's peace, hold one's tongue, hush up, keep secret, keep silence, pass over in silence