Lexical Definition

‎ἀστοχέω‎ astochéō (as-tokh-eh'-o) to deviate ^G:V
from a compound of ‎Α‎ (as a negative particle) and (an aim)

err, swerve.

• to miss the mark, i.e. (figuratively) deviate from truth

Abbott-Smith

**† ἀστοχέω, -ῶ (στόχος, a mark), [in LXX: Si 7:19 8:9*;]
to miss the mark, fail: c. gen., I Ti 1:6 (so in π., MM, s.v.); seq. περί, I Ti 6:21, II Ti 2:18.†

Abbott-Smith References

Liddell-Scott-Jones

ἀστοχέω-έω,

miss the mark, miss, τοῦ συμφέροντος[Refs 2nd c.BC+]; fail, περί τινος[Refs 2nd c.BC+]; περὶ τὴν πίστιν, τὴν ἀλήθειαν, [NT+1st c.AD+]

_{LSJ Scripture Refs: 1Tim.6.21}