in a word; to put it briefly; to make a long story short
Used to summarize or rephrase a preceding statement concisely. Often appears at the beginning of a sentence or after a pause.
In short, he is not suited for that job.
To put it briefly, we need more money.
Fixed expression from 早く (quickly) + 言えば (conditional of 言う, to say), literally 'if one says it quickly'.