No. A chalice is a type of cup; the phrase simply means a cup taht has been poisoned, and there is no oxymoron in it.
The Poisoned Chalice
Merlin - 2008 The Poisoned Chalice 1-4 is rated/received certificates of: Netherlands:9
Poisoned Chalice The UN in Iraq - 2006 was released on: USA: 5 June 2006 (United Nations Association Film Festival)
the mark of nimeuh the poisoned chalice excalibur le morte d'arthur
Morgana gets poisoned by Merlin in the episode titled "The Poisoned Chalice," which is the 4th episode of Season 2 of Merlin. In this episode, Merlin uses a potion to poison the chalice intended for Arthur, but Morgana inadvertently drinks from it instead. This incident highlights the complexities of Merlin's decisions and the unforeseen consequences they can have on those around him.
David McLaughlin has written: 'Poisoned chalice' 'Breaking the Parental Ties That Bind'
It should be spelled 'poisoned chalice'. A chalice is a drinking cup with a stand and stem such as used in religious ceremonies. So the term refers to being given a poisoned drink presented in an attractive looking vessel. The expression mean something that looked good when offer but turns out bad.The new job turned out to be a poisoned chalice; the old marketing plan did not work and the new one was doomed to fail. Guess who got the sack!
In the poisoned chalice. it is the 3rd episode in series 1 of Merlin.
chalice
The Communion is in a ciborium and the wine is in a chalice.
George Carlin referred to "military intelligence" as an oxymoron in one of his comedy performances.
what is an oxymoron for vaguely