what is the difference between back and head?

[Jepardino]

English Language Tests, Intermediate level

ESL/EFL Test #48 "Speaking: The Wedding", question 4

The other students described them as Romeo and Juliet and used to make fun of them behind their ..........

(a) heads
(b) eyes
(c) ears
(d) backs

English Language Tests, Intermediate level

ESL/EFL Test #48 "Speaking: The Wedding", answer 4

The other students described them as Romeo and Juliet and used to make fun of them behind their backs.

Correct answer: (d) backs
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what is the difference between back and head?

Jepardino

[Mister Micawber]

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Please try your DICTIONARY for the words. 'Behind one's back' is an idiom meaning 'intentionally without one's knowledge'.
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Native English teacher at Mister Micawber's