Is a couple dozen lighthousesa correct English?

The phrase "a couple dozen lighthouses" is grammatically correct, but it's a bit awkward. Here's why:

* "Couple" is usually used for smaller numbers. A couple dozen suggests a relatively large number, and it's a bit unusual to use "couple" in that context.

* "Dozen" implies a precise number (12). "A couple dozen" implies a range, likely somewhere between 24 and 36.

Here are some better options depending on the context:

More precise:

* "Two dozen lighthouses"

* "Twenty-four lighthouses"

* "Several dozen lighthouses" (if you want to be more general)

More informal:

* "Lots of lighthouses"

* "A good number of lighthouses"

Ultimately, the best choice depends on the tone and specific meaning you want to convey.