first, second, etc. go

first go

On the first try. Primarily heard in UK. I can't believe I solved that difficult puzzle first go!
See also: first

second go

On the second try. Don't worry, honey—I'm sure you'll pass the test second go.
See also: second

first, second, etc. ˈgo

(British English) at the first, second, etc. attempt: I passed my driving test first go.