sick

1 sick /ˈsɪk/ adjective
sicker; sickest
1 sick
/ˈsɪk/
adjective
sicker; sickest
Britannica Dictionary definition of SICK
[also more sick; most sick]
1 
: affected with a disease or illness : ill
— sometimes used figuratively — see also airsick, carsick, seasick
2 
always used before a noun : of or relating to people who are ill
3 
a  not used before a noun, informal : very annoyed or bored by something because you have had too much of it — + of
b  : very disgusted or angry
4 
: not mentally normal or healthy
5 
: relating to very unpleasant or offensive things
6 
a  : very unpleasant
b  : powerfully affected by a strong and unpleasant emotion — usually + with
— see also homesick, lovesick

be sick

: to vomit

call/phone in sick

◊ If you call/phone in sick, you make a phone call to your place of work to say you will not be working that day because you are sick.

feel sick

1 
US : to feel ill
2 
: to feel like you will vomit
3 
US : to feel very upset

report sick

— see 2report

sick at heart

— see heart

sick to your stomach

1 
US : caused to vomit : feeling like you are going to vomit
2 
: feeling very disgusted or angry

the sick

: people who are sick : sick people
2 sick /ˈsɪk/ noun
2 sick
/ˈsɪk/
noun
Britannica Dictionary definition of SICK
[noncount] British, informal
: vomit
3 sick /ˈsɪk/ verb
sicks; sicked; sicking
3 sick
/ˈsɪk/
verb
sicks; sicked; sicking
Britannica Dictionary definition of SICK

sick up

[phrasal verb]
sick up (something) or sick (something) up British, informal
: to vomit (something)