Как произносится upstart?

Перевод слова upstart

Определение слова upstart

• an arrogant or presumptuous person
• a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class
• a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest