tell

1. tell (verb) — sense 1

Definition: Mental senses related to determining, reckoning, or perceiving: To determine the number, amount, or value of [something].

Example: All told, there were over a dozen.  Can you tell time on a clock?  He had untold wealth.

2. tell (verb) — sense 2

Definition: Mental senses related to determining, reckoning, or perceiving: To notice, discern. (Roughly, "can tell" means "know" but with a sense of direct perception.)

Example: I can tell that you're thrilled.

3. tell (verb) — sense 3

Definition: Mental senses related to determining, reckoning, or perceiving: To notice, discern. (Roughly, "can tell" means "know" but with a sense of direct perception.): To pick up on a difference. (See tell apart for more.)

Example: An expert can tell an original from a forgery.

4. tell (noun) — sense 4

Definition: A reflexive, often habitual behavior, especially one occurring in a context that often features attempts at deception by persons under psychological stress (such as a poker game or police interrogation), that reveals information that the person exhibiting the behavior is attempting to withhold.

5. tell (noun) — sense 5

Definition: A giveaway; something that unintentionally reveals or hints at a secret.

Example: Those whose business it is to verify luxury bags insist, at least publicly, that there’s always a “tell” to a superfake.

6. tell (noun) — sense 6

Definition: That which is told; a tale or account.

Example: April 4, 1743, Horace Walpole, letter to Sir Horace Mann
I am at the end of my tell.