An ENG-GER dictionary (there seem to be no entries in monolingual dictionaries) tells me that it is a power connection, but search results from Google and Google Images let me assume that the term is used only for outdoor purposes, and especially for camping sites. Is this correct or what else would be an appropriate meaning?
Learn English – What exactly is an electric hook up
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The definition
obnoxious (adj.) very rude, offensive, or unpleasant : an obnoxious child; an obnoxious habit
is almost correct, but as commonly used, obnoxious also implies that the offensiveness is difficult to ignore. An obnoxious child is not just rude, but loudly or aggressively so. An obnoxious color or combination of colors is unpleasant but also intense or bright like the way the building in the linked article was painted:
I would rewrite the definition as
obnoxious (adj.) very rude, offensive, or unpleasant in a way that is difficult to ignore: an obnoxious child; an obnoxious habit
I don't know if I feel hatefulness toward an obnoxious person - I think it's too strong a word. I would describe it as strong dislike mixed with annoyance.
Labor is uncountable when it refers to effort or work in the abstract, or to those who labor en masse.
Labor was something he had never known or wanted to know, being born with a silver spoon in his mouth.
Labor was divided in respect to the proposed tariffs.
Labors refers to instances of effort or work, as in
The sculpture depicts the twelve labors of Hercules, which are as follows: ...
Labors can also refer to a multiplicity of efforts presented as a unity or monolith:
She was rewarded with a corner office for her labors.
There, you could paraphrase "her labors" as "all her hard work".
Best Answer
According to Cambridge online dictionary, hook-up means:
In North American English variants, hook-up typically means the connection to any utility, irrespective of where. The meaning is very generic. Your house might get a new telephone hook-up, or Rogers might be hooking up your new Internet.