παρεισφέρωpareisphérō, par-ice-fer'-o; from G3844 and G1533; to bear in alongside, i.e. introduce
simultaneously:—give.
Thayer's Greek Lexicon
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STRONGS G3923:
παρεισφέρω: 1 aorist παρεισήνεγκα; a.to bring in besides (Demosthenes, others). b.to contribute besides to something: σπουδήν, 2 Peter 1:5 (R. V.adding on your part).