I'm not English-speaking, and I'm wondering about the title of the song by band Bauhaus - "Terror Couple Kill Colonel"
"Kill" implies a singular subject, yet couple refers to multiple subjects. Why is it not "killed" or "kills"?
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"Couple" can be taken as singular or plural depending on the context.
When used to refer to two people who function socially as a unit, as in a married couple, the word couple may take either a singular or a plural verb, depending on whether the members are considered individually or collectively. -The Free Dictionary
That sounds like a newspaper headline and, as such, it shows a telegraphic style of writing. In this case, in addition to what has already been mentioned by JoAnne ("couple" being considered "two persons" and verb, therefore, in the plural) the article before "terror couple" has been omitted.
Because space is limited, headlines are written in a compressed telegraphic style, using special syntactic conventions: Wikipedia
- Forms of the verb "to be" are omitted.
- Articles are usually omitted.
- Most verbs are in the simple present tense, e.g. "Governor signs bill".
- The future is expressed as "to" followed by a verb, e.g. "Governor to sign bill".
- In the US (but not the UK), conjunctions are often replaced by a comma, as in "Bush, Blair laugh off microphone mishap".
- To save space, a long word sometimes replaced by a shorter word with not quite the same meaning, e.g. "attack" to mean "criticize".
Couple is one of a couple hundred words in the English language that is categorized as collective nouns -- team is another very familiar collective noun, as are family and congregation. While it is evident these nouns describe a group -- more than one -- they do not always call for a plural verb.
With collective nouns, subject/verb agreement is determined by the manner in which the group achieves the action described by the verb: individually or collectively.
If it achieves the action collectively (as a single unit), your verb is singular:
If it achieves the action by acting as individuals, your verb is plural:
In your specific example, we could assume that person one gave the guy slow-working poison on day one and person two shot him the next day. In the more likely alternative, we could assume the two people jointly beat the guy to death, and yet another song title is written in sloppy English :-)