tell

tell /ˈtɛl/ verb
tells; told /ˈtoʊld/ ; telling
tell
/ˈtɛl/
verb
tells; told /ˈtoʊld/ ; telling
Britannica Dictionary definition of TELL
1 
[+ object]
a  : to say or write (something) to (someone)
— often + about — often + that
— often + what, where, etc.
◊ This sense of tell is often used informally to emphasize a statement.
b  : to say (a word or words) to (someone)
2 
a  : to give information to (someone) by speaking or writing
[+ object]
[no object]
b  : to let (someone) know a secret
[+ object]
[no object]
3 
[+ object] : to express (something) by speaking
4 
[+ object] : to give (someone) an instruction or command
— usually followed by to + verb
5 
: to inform others that someone has done something wrong or behaved badly — used especially by children
[no object]
[+ object]
— see also tell on 1 (below)
6 
[+ object] : to give information to (someone or something) by doing a particular action or making a particular sound
7 
[+ object] : to make (something) known to (someone)
8 
not used in progressive tenses, [+ object] : to see or understand the differences between two people or things
9 
not used in progressive tenses : to see or know (something) with certainty
[+ object]
— usually used after can or could
[no object]

all told

— see 2all

don't tell me

informal
1 
— used to show that you already know what someone is going to say especially because he or she often says such things
2 
— used to express surprise and disappointment

I/I'll tell you what

informal also tell you what
— used to introduce a suggestion or to emphasize a statement

I told you (so)

informal
— used to say to someone that you were right about something especially when that person disagreed with you

tell against

[phrasal verb]
tell against (someone) British, formal
: to be a disadvantage to (someone)

tell apart

[phrasal verb]
tell (someone or something) apart
: to see what the differences are between (people or things) : to identify (people or things that look similar to each other)

tell it like it is

US, informal
: to say what the facts are : to speak about unpleasant things in an honest way

tell me

— used in speech to introduce a question

tell me about it

informal
— used to say that you understand what someone is talking about because you have had the same or a similar experience

tell of

[phrasal verb] formal + literary
1 
tell of (something)
a  : to be evidence of (something) : indicate
b  : to describe (something) : to make the details of (something) known
2 
tell (someone) of (something) : to talk to (someone) about (something)

tell off

[phrasal verb]
1 
tell (someone) off or tell off (someone) informal
US : to yell at or insult (someone who did or said something that made you angry) — often + for
2 
British : to criticize (someone) in an angry way from a position of authority — often + for

tell on

[phrasal verb]
1 
tell on (someone) informal : to tell someone in authority about the bad behavior or actions of (someone)
2 
tell on (someone or something) not used in progressive tenses : to have a noticeable effect on (someone or something)

tell time

or tell the time
— see 1time

there's no telling

— used to say that it is impossible to know something with certainty

you're telling me

informal
— used to say that you already know and completely agree with something that was just said