Final answer:
In English, a 'turn-off' refers to something that causes a loss of interest or enthusiasm, often due to being off-putting or unappealing.
Step-by-step explanation:
In the context of this question, a "turn-off" is not associated with being a killjoy or an entertainer. Instead, the phrase 'turn-off' typically refers to something that causes a loss of interest or enthusiasm. It can be used to describe a person or behavior that is off-putting or unappealing, thereby causing interest to diminish. For instance, in a social setting, someone who constantly complains may be considered a turn-off because their behavior could discourage others from enjoying the occasion.