boost
US /buːst/
UK /buːst/

1.
to help improve something or make it more successful
:
•
The new advertising campaign aims to boost sales.
•
Winning the competition really boosted her confidence.
1.
an act of helping or encouraging someone or something
:
•
The tax cuts gave the economy a much-needed boost.
•
A word of encouragement can give someone a big boost.