συγκεράννυμιsynkeránnymi

to commingle, i.e. (figuratively) to combine or assimilate

Greek (New Testament) · G4786

Meanings

to mix or blend together, compound: with accusative, 1 Corinthians 12:24; participle perfect passive, Hebrews 4:2, T, WH, margin, R, margin; id., of persons, with dative instr., to be united with, agree with, ib., WH, text, R, text.

Same root

σύνsýn · G4862with or together (but much closer than G3326 (μετά) or G3844 (παρά)), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.
κεράννυμιkeránnymi · G2767to mingle, i.e. (by implication) to pour out (for drinking)

Where it appears

Appears 2 times in the Bible.

1 Corinthians 12:24 while the more honorable parts do not require this special care. So God has put the body together such that extra honor and care are given to those parts that have less dignity.
Hebrews 4:2 For this good news—that God has prepared this rest—has been announced to us just as it was to them. But it did them no good because they didn’t share the faith of those who listened to God.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.