care

1 care /ˈkeɚ/ noun
plural cares
1 care
/ˈkeɚ/
noun
plural cares
Britannica Dictionary definition of CARE
1 
[noncount] : effort made to do something correctly, safely, or without causing damage
2 
[noncount]
a  : things that are done to keep someone healthy, safe, etc.
— see also day care, health care, intensive care, primary care, acute care at acute
b  : things that are done to keep something in good condition
3 
[count] : something that causes you to feel worried or unhappy

care of

: at the address of
— abbreviation c/o

in/into care

British
— used to describe children who are being cared for by a government organization because their parents have died or are unable to care for them properly

take care

: to be careful : to use caution
— often used informally to express good wishes when someone is leaving or at the end of a letter

take care of

1 
: to do the things that are needed to help or protect (someone) or to keep (something) in good condition : to care for (someone or something)
2 
: to deal with or do (something that requires effort or attention)
2 care /ˈkeɚ/ verb
cares; cared; caring
2 care
/ˈkeɚ/
verb
cares; cared; caring
Britannica Dictionary definition of CARE
1 
: to feel interest in something : to be interested in or concerned about something
[no object]
— often + about
[+ object]
2 
[no object] : to feel affection for someone
3 
[no object] somewhat formal : to want to do something or to be something

as if I cared

informal
— used in angry speech to say that you do not care at all about something

care a damn

— see 3damn

care for

[phrasal verb]
1 
care for (someone or something) : to do the things that are needed to help and protect (a person or animal) : to look after (someone or something)
2 
care for (someone) : to feel affection for (someone)
3 
care for (something) somewhat formal
a  : to like or enjoy (something) — often used in negative statements
b  : to want (something)

could/couldn't care less

informal
◊ If you could care less (US) or couldn't care less, you are not at all concerned about or interested in something.

for all (someone) cares

informal
— used to say that someone does not care at all about something

see if I care

informal
— used in angry speech to say that you do not care at all about something

what does (someone) care?

informal
— used to say that you do not think someone should have any interest in something

who cares?

informal
— used to stress that something is not important.