Upstart/ˈʌpstɑːrt/ Definition 1 of 2Pro Tip 1/3Sudden Rise Use 'upstart' for someone who quickly gains status, often surprising others. The tech industry is full of upstarts who become CEOs overnight. Pro Tip 2/3Negative Tone 'Upstart' generally carries a negative connotation, implying arrogance. The upstart executive dismissed the advice of his experienced peers. Pro Tip 3/3Not Established An 'upstart' is often seen as lacking establishment or traditional legitimacy. Old companies view these upstarts as threats to their dominance.