usage of "make"

Hi,

Could you tell me if the following sentence is correct and natural?

Thanks !

on second thought[color=blue]s, make that 12.

It’s fine.

.
The only version of this expression that I hear used is “on second thought”.

I can’t recall ever having heard someone use this expression with the plural ‘thoughts’.
However, it would be common to hear someone say “He’s having second thoughts”.
.

It must be another of those BrE vs AmE things:

The BNC to the rescue, again:

ON SECOND THOUGHTS 62

ON SECOND THOUGHT 5

I’d imagine “on second thoughts” has an ellipted “having” between the “on” and second". So the plural would seem more logical.

Yup, it looks like a variant problem:

The BYU American corpus:

ON SECOND THOUGHT 162

ON SECOND THOUGHTS 4

Hi, Amy

When I was writting “on second thought” I was having second thoughts if it is right, and my dictionary supported the “on second thoughts” version, but I heard “on second thought” a few times in a cartoon, so I cast away my doubts :slight_smile:

Thanks again !