Lexical Definition

‎μυέω‎ myéō (moo-eh'-o) to initiate ^G:V
from the base of ‎μυστήριον‎

instruct.

• to initiate, i.e. (by implication) to teach

Abbott-Smith

** μυέω, -ῶ (< μύω, to shut the mouth), [in LXX: III Mac 2:30*;]
to initiate into the mysteries (so chiefly in cl.; LXX, III Mac 2:30); hence, to instruct: pass., Phl 4:12 (RV, I have learned the secret).†

Abbott-Smith References

Liddell-Scott-Jones

μυέω,

(μύω, which see) initiate into the mysteries, μυῶν.. ἄλλους ξένους [Refs 5th c.BC+]:—more frequently in passive, to be initiated, ὁ βουλόμενος μυεῖται [Refs 5th c.BC+]; οἱ μεμυημένοι[Refs 5th c.BC+]; μυηθῆναι ἀφ᾽ ἑστίας, see at {ἑστί; τοῦ ἀφ᾽ ἑστίας μυουμένου} probably in [Refs 1st c.AD+]; θεοπρόποι ἦλθον.., οἵτινες μυηθέντες ἐνεβάτευσαν [Refs 2nd c.AD+]: with accusative cognate, to be initiated in a thing, τὰ μυστήρια μυεῦνται [Refs 1st c.AD+]; ὅστις τὰ Καβείρων ὄργια μεμύηται in the mysteries of the Cabiri, [Refs 5th c.BC+]; τὰ μεγάλα (i.e. μυστήρια) μεμύησαι, πρὶν τὰ σμικρά [Refs 5th c.BC+]

__II generally, teach, instruct, with infinitive, ἐμύησάς τινα ἰδεῖν [Refs 1st c.AD+]:—passive, μεμύημαι καὶ χορτάζεσθαι καὶ πεινᾶν [NT+4th c.AD+]

_{LSJ Scripture Refs: Phil.4.12}