to steal: to take by stealth what belongs to someone else
This is the ordinary word for stealing, the quiet kind of theft: taking what is not yours in a way that hopes to go unnoticed. It sits behind the flat command "You shall not steal," quoted from the Ten Commandments across the Gospels and Paul's letters, and it names both petty pilfering and a planned cover-up, such as the plot to steal Jesus' body from the tomb.
What marks this word is the manner, not the size, of the crime. It points to secrecy and deceit rather than open force. Greek keeps that distinction sharp: to snatch something away by force is a different word (ἁρπάζω), and the violent highway robber is named by yet another (λῃστής). The one who does this stealing is the "thief" (κλέπτης), built from the same root, who in John's Gospel slips in to steal and kill.
The range of things stolen is wide. It covers treasure a burglar digs through a wall to reach, a body carried off by night, and, in the case of the man told to "steal no more" and work with his hands instead, whatever he had been quietly taking before.