boost

Concise Oxford English Dictionary © 2008 Oxford University Press:
boost/buːst/

▶verb

• 1 help or encourage to increase or improve.

• 2 N. Amer. push from below.

▶noun

• 1 a source of help or encouragement.

• 2 N. Amer. a push from below.

– origin C19 (orig. US, in sense 2 of the verb): of unknown origin.