(~s)
1.
Tonic or ~ water is a colourless fizzy drink that has a slightly bitter flavour and is often mixed with alcoholic drinks, especially gin.
Keeler sipped at his gin and ~.
...low-calorie ~s.
N-MASS
2.
A ~ is a medicine that makes you feel stronger, healthier, and less tired.
Britons are spending twice as much on health ~s as they were five years ago...
N-MASS
3.
A ~ is anything that makes you feel stronger, more cheerful, or more enthusiastic.
Seeing Marcus at that moment was a great ~...
= boost
N-COUNT: oft adj N, N for n