fall through

New2grammarIf all of his promises fall through/are carried out, our national debt will increase by 4.5 trillion over 10 years.

1. Are they synnonymous? -No

Thanks.

Fall through - not come about

What's the opposite of fall through?

Perhaps you are thinking of - follow through

If all of his promises are followed through/carried out

Hi N2G

The phrasal verbs 'fall through' and 'carry out' are more or less opposite ideas. (But I assume you know that already.)

The phrasal verb 'fall through' indicates a failure (i.e. basically not done or carried out). In my opinion, however, 'fall through' does not collate as well with 'promises' as 'carry out' does. A plan or a deal can fall through, for example.

Yankee 'fall through' does not collate

What would be a good substitute for fall through?

You can renege on a promise - but that really means to go back on your promise.

An idea can fall through. A proposition can fall through.

I would substitute with , fail to materialise.