In Christiansen, it means a complete cessation of function when used of an animal, but when used of a human, it means “separation”.
Could you point to an example that you have in mind?
I am pretty sure when it says that Lazarus had died ... it means just what we think it means. Same with Ananias and Sophira when they died. Jesus when he died and Stephen when he died.
Here are the uses of the word just in the book of Acts:
[Act 2:23-24 NASB] 23 this [Man,] delivered over by the predetermined plan and foreknowledge of God, you nailed to a cross by the hands of godless men and put [Him] to death. 24 "But God raised Him up again, putting an end to the agony of death, since it was impossible for Him to be held in its power.
[Act 3:15 NASB] 15 but put to death the Prince of life, [the one] whom God raised from the dead, [a fact] to which we are witnesses.
[Act 5:30 NASB] 30 "The God of our fathers raised up Jesus, whom you had put to death by hanging Him on a cross.
[Act 8:1 NASB] 1 Saul was in hearty agreement with putting him to death. And on that day a great persecution began against the church in Jerusalem, and they were all scattered throughout the regions of Judea and Samaria, except the apostles.
[Act 9:24, 29 NASB] 24 but their plot became known to Saul. They were also watching the gates day and night so that they might put him to death; ... 29 And he was talking and arguing with the Hellenistic [Jews;] but they were attempting to put him to death.
[Act 10:39 NASB] 39 "We are witnesses of all the things He did both in the land of the Jews and in Jerusalem. They also put Him to death by hanging Him on a cross.
[Act 12:2 NASB] 2 And he had James the brother of John put to death with a sword.
[Act 13:28 NASB] 28 "And though they found no ground for [putting Him to] death, they asked Pilate that He be executed.
[Act 22:4 NASB] 4 "I persecuted this Way to the death, binding and putting both men and women into prisons,
[Act 23:29 NASB] 29 and I found him to be accused over questions about their Law, but under no accusation deserving death or imprisonment.
[Act 25:11, 25 NASB] 11 "If, then, I am a wrongdoer and have committed anything worthy of death, I do not refuse to die; but if none of those things is [true] of which these men accuse me, no one can hand me over to them. I appeal to Caesar." ... 25 "But I found that he had committed nothing worthy of death; and since he himself appealed to the Emperor, I decided to send him.
[Act 26:10, 21, 31 NASB] 10 "And this is just what I did in Jerusalem; not only did I lock up many of the saints in prisons, having received authority from the chief priests, but also when they were being put to death I cast my vote against them. ... 21 "For this reason [some] Jews seized me in the temple and tried to put me to death. ... 31 and when they had gone aside, they [began] talking to one another, saying, "This man is not doing anything worthy of death or imprisonment."
[Act 28:18 NASB] 18 "And when they had examined me, they were willing to release me because there was no ground for putting me to death.