Thrill; boot (4)
I believe the answer is:
kick
I believe this is a double definition.
'thrill' is the first definition.
(synonyms)
'boot' is the second definition.
(synonyms)
(Other definitions for kick that I've seen before include "Extra spurt of speed" , "Boot; stimulant effect" , "Boot, thrill of pleasure" , "Hit with foot" , "Buzz" .)