get-go
The initial moment
The get-go is the very beginning or start of something, used almost exclusively in the phrase from the get-go: I knew from the get-go this would be trouble.
The expression is informal and emphatic—it stresses that something was true from the earliest moment, not gradually discovered.
start
To set going
commencement · kickoff · dawn · genesis · origin · birth · threshold · baseline · foundation · groundwork