to drink: to take liquid into the body by mouth
At its core this is the ordinary verb for drinking, the everyday partner of eating. Most of the time it means exactly that: a person takes water, wine, or some other liquid and swallows it. The Gospels use it constantly for normal life, eating and drinking, getting drunk, refusing a drink, going days without one.
From that plain physical act the New Testament builds several vivid pictures, all of which still feel like drinking. The strongest is "the cup": to drink a cup is to take in and go through whatever that cup holds. Jesus speaks of a cup the Father has given him to drink, meaning the suffering and death he must accept. The book of Revelation turns the same image dark in the other direction, where the wicked are made to drink the cup of God's anger, taking his judgment fully into themselves.
Around the Lord's table the word carries its own weight. To drink the cup at the supper is to share in what Christ's death secured, and Jesus promises he will drink it new with his people in God's kingdom, so the act looks forward as well as back. John's Gospel pushes furthest: to drink the water Jesus gives, or to drink his blood, is to receive him and the life he brings, so that the thirsty never thirst again.
What holds all of this together is the single idea of taking something in by drinking. Whether the liquid is water, wine, suffering, wrath, or life itself, the verb keeps its plain shape, and the context tells the reader what is in the cup.