Song to sing (4)
I believe the answer is:
tune
(Other definitions for tune that I've seen before include "Adjust a radio receiver to a frequency" , "Air, melody" , "Melody; adjust (engine)" , "strain" , "Of engine, adjust to run smoothly" .)
I believe the answer is:
tune
(Other definitions for tune that I've seen before include "Adjust a radio receiver to a frequency" , "Air, melody" , "Melody; adjust (engine)" , "strain" , "Of engine, adjust to run smoothly" .)