Important here is how you categorize this object: Mug, Goblet, Glass, or even Grail. Different terms refer to different moods and points of view and lead to different interpretations.
If seen as a chalice, it always indicates something extraordinary (it is not just a simple mug or a glass used every day!). It may either represent suffering or death (the “hemlock cup” of antiquity, for example) or the search for a higher goal (legend of the Grail and the magnificent interpretation by Emma Jung in her book The Legend of the Grail As Seen in Depth Psychology).
A chalice holds the liquid that is the equivalent of our emotions and needs.
The image of the chalice implies that these emotions and needs are spiritual in nature. Figuratively speaking, it is a matter of nurturing the soul and cultivating the emotions. That was precisely the task of the search for the Grail in the Middle Ages. In Christianity, the chalice is connected with the heart and blood of Christ.... Little Giant Encyclopedia
1- In dreams the chalice represents the feminine. Because of its religious significance, the chalice usually represents something that may seem to be unattainable except without a great deal of effort. It can also represent an important event or ceremony (see Cup).
2- The chalice is associated with the symbolism of the heart, containing the lifcblood. In the chalice this is represented by wine wine and blood having the same meaning.
3- The source of inexhaustible sustenance, abundance, the Holy Grail.... Ten Thousand Dream Dictionary
The chalice may represent the Holy Grail, the vessel that unites the recipient with Chnst. As the pnze of a spintual quest, the chalice represents enlightenment. Holding wine, the blood of Chnst, it is associated with communion.
A chalice may also signify the container of the feminine principle or the goddess’s wealth bestowed to you.... Ariadne's Book of Dream
Dreams of a chalice symbolize immortality and a thirst for spiritual nourishment.
If you are drinking from this sacred goblet, you are in the midst of a rite of passage, transforming, and moving from glory to greater glory along your life path. Your dream is suggesting that you make room for more abundance and opulence to come into your life. Also, a silver chalice represents justice and that the truth will always prevail. See Cup and Holy Grail.... Strangest Dream Explanations
The chalice is symbolic of the source of inexhaustible sustenance, abundance and the holy grail. Because of this religious significance, the chalice usually represents something that may seem to be unattainable except without a great deal of effort.... Dream Meanings of Versatile
(see Abyss, Basket, Beverages by type, Bowl, Circle, Cauldron)
Alternative womb and fertility symbol, especially if filled with liquid (see Milk, Juice, Water, Wine).
Arthurian and Druidical lore identify this emblem as the grail, the cup that signifies humankind’s connection with nature and each other.
Christian: The sacredness of life and the quality of forgiveness (the cup of Christ’s blood). In this case, do you drink freely of what’s offered you, or pour it away?
Unity. In Gypsy, pagan, and Hebrew marriage and courtship rites, people drinking from one cup link their destinies and become as one.
Refusing: Wishing to avert a personal trial that is really unavoidable (note the story of Christ in the garden of Gethsemane). Alternatively, rejecting an opportunity for friendship or camaraderie because of suspicious motivations.
In Eastern philosophy, a cup is shaped by what it contains. What metaphorical beverages do you incorporate into yourself by drinking of this cup?... The Language of Dreams