0 to increase or improve something -- aumentare, incrementare
1 something that makes you feel more confident and happy, or that helps something to increase or improve -- spinta
Passing my test was a boost to my confidence. Superare l’esame ha dato una spinta alla mia fiducia in me stessa.
2 to expand; to make greater; to improve -- aumentare, gonfiare
Winning the game helped to boost his confidence.
We’ve succeeding in boosting the sales figures
3 a piece of help, encouragement etc -- spinta