Strong's #1957: epimartureo (pronounced ep-ee-mar-too-reh'-o)
from 1909 and 3140; to attest further, i.e. corroborate:--testify.
Thayer's Greek Lexicon:
̓́
epimartureō
1) to bear witness to, establish by testimony
Part of Speech: verb
Relation: from G1909 and G3140
Citing in TDNT: 4:508, 564
Usage:
This word is used 1 times:
1 Peter 5:12: "briefly, exhorting, and testifying that this is the true"