(idiomatic) To perceive things as different, or to perceive their difference itself; to differentiate, distinguish, discriminate.

A telescope which produces a magnified image by reflecting light through a series of mirrors housed in a tube, using a large curved mirror to gather the light and one or more additional mirrors to transmit the light to an eyepiece.

A telescope which produces a magnified image by refracting light through a series of lenses housed in a tube, with a light-gathering objective lens at one end and an eyepiece at the other.

(usually childish) To inform on, to rat out; to tell a person in authority that someone else has done something wrong. / To cause visible strain to.

A utility pole that supports telephone lines

(idiomatic) An attestation to the truthfulness and frankness of an associated statement.

Used other than figuratively or idiomatically: see tell, truth.

(idiomatic, informal) Used to positively assert the frank honesty of an associated statement of set of statements; equivalent to "to tell the truth".

(idiomatic) To lie, to be making false claims.

plural of tell tale