In the United States, a person under examination on the witness stand may "plead the fifth" to avoid self-incrimination. In other words, a person asserts his or her Fifth Amendment right.
Citizens of many English-speaking countries have the right to remain silent and laws to protect against self-incrimination (testifying against yourself). In the UK, how do witnesses or defendants respond in court? Do they literally remain silent, invoke a particular law, or say "no comment"?
Include the legal traditions of other English-speaking countries if relevant. However, with nearly one hundred such nations, I don't wish to promote giving an answer for each one.
To be clear: I am looking for the words a defendant might say on the witness stand. If there's no standard response, then that's an acceptable answer. If defendants would never say something like it because they wouldn't be on the stand unless they had waived their right to silence, then that's an acceptable answer.