to make alive: to give life to what is dead or lifeless
The word joins "living" and "make," so at its root it means to cause something to live. Before the Bible it was a rare, technical word, used by Greek writers on nature for animals that bear live young. The Greek Old Testament gave it a fresh purpose, pressing it into service for the one act only God can do: to kill and to make alive, to raise a person from death.
In the New Testament almost every use carries that weight. It names the raising of the dead (God, who gives life to the dead, in Romans 4:17; the mortal body made alive in Romans 8:11), and it names the new, lasting life given through the Spirit that human effort and the written law can never produce (2 Corinthians 3:6; John 6:63).
The senses stay close because they are the same act seen in different settings: God imparting life where there was none. What shifts is who is said to do it. The same life-giving is credited to the Father, to the risen Son, and to the Spirit, which is why the word carries far more weight than its handful of appearances would suggest.
Nuances
What "made alive in the spirit" refers to, which in turn decides who the imprisoned spirits of the following verses are and when Christ went to them.
- majorityChrist's bodily resurrection, understood as his entry into the unhindered realm of the Spirit; the "going" that follows is his ascension, and the imprisoned spirits are rebellious angels.; Dalton, Christ's Proclamation to the Spirits (AnBib 23); Elliott, 1 Peter (Anchor Bible 37B), 645-679; Michaels, 1 Peter (WBC 49), 204-205; Achtemeier, 1 Peter (Hermeneia), 250-262
- minorityChrist's spirit was made alive between his death and resurrection so that he could descend and preach to the dead.; Selwyn, The First Epistle of St. Peter
- minorityChrist preached in the spirit through Noah to Noah's generation before the incarnation.; Grudem, 1 Peter (Tyndale New Testament Commentary); Calvin, Institutes of the Christian Religion 2.16.9
How closely Paul's phrase "a life-giving spirit" identifies the risen Christ with the Holy Spirit.
- contestedA functional identification: in the believer's experience the risen Christ and the Spirit are one and the same.; Dunn, Christology in the Making
- contestedA description of Christ's transformed risen existence, from which he now dispenses life, while Christ and the Spirit remain distinct persons.; Fee, The First Epistle to the Corinthians (NICNT), 787-795; Thiselton, The First Epistle to the Corinthians (NIGTC), 1275-1282
- contestedA close working intimacy between Christ and the Spirit reached at the resurrection, without collapsing the two into one.; Gaffin, Resurrection and Redemption; Fatehi, The Spirit's Relation to the Risen Lord in Paul (WUNT 2/128)