At or in one go and At once

At once and at or in one go are semantically related In some cases you can replace phrase "At once" with "At or in one go", this phrases are similar.

At once adverb - Without delay or hesitation; with no time intervening.

At or in one go and at once are semantically related in simultaneously topic. Sometimes you can replace phrase "At or in one go" with "At once", this phrases are similar.