Sorry, no definitions found. You may find more data at ldoce.
Sorry, no etymologies found.
It is the same even with a more extensive restricted defining vocabulary, such as the one Longman uses in LDOCE.
LDOCE CD-ROM] It's hard to tell how long the job will take.
LDOCE CD-ROM] The moment Kramer walked in, I could tell that things were not going well. tell (something) a mile off (= know easily) [Look up a word starting with D or S for samples of headword or sentence pronunciations on the
LDOCE CD-ROM] You could tell a mile off that he was lying. tell when/how/whether/if etc