Short rest (3-4)
'short rest' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for breather that I've seen before include "Short rest break" , "lung, possibly?" , "Short rest between bouts of exercise" , "Short pause for rest" , "A rest - lung?" .)
'short rest' is the definition.
(to lie down is to have a short rest; 'short' suggests a short form)
This is the entire clue.
(Other definitions for lie-down that I've seen before include "Short rest" , "Rest (with or without sleep)" .)