(I/I'll) tell you what

idiom (1)

Definition of (I/I'll) tell you what

 (Entry 1 of 6)

informal
used to introduce a suggestion or to emphasize a statement(I'll) Tell you what—I'll let you borrow the car if you fill it up with gas.I tell you what, I wouldn't pay that much for a pair of shoes.

can't begin to tell you

idiom (2)

Definition of can't begin to tell you (Entry 2 of 6)

used to indicate that something is so very good or so much appreciatedI can't begin to tell you how grateful I am for all your help.

I can't tell you

idiom (3)

Definition of I can't tell you (Entry 3 of 6)

informal
used to emphasize a statementI can't tell you how pleased we are that you could join us.

I couldn't tell you

idiom (4)

Definition of I couldn't tell you (Entry 4 of 6)

: I don't know "Do you know where the library is?" "I'm sorry. I couldn't tell you."

to tell (you) the truth

idiom (5)

Definition of to tell (you) the truth (Entry 5 of 6)

used to say that one is being honest and admitting somethingTo tell the truth, I liked her first book better,To tell you the truth, I don't remember when I saw her last.

what did I tell you

idiom (6)

Definition of what did I tell you (Entry 6 of 6)

used to say to someone that he or she should have listened and followed one's advice"The car turned out to be a lemon!" "What did I tell you?"

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concealed or difficult to comprehend

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