The initial idioms of the letter S

sing	sing a different tune
sing along	change one's tune
sing before breakfast, you'll cry before night	sing for one's supper
sing for supper	sing the same tune
sing of	sing or praises
sing out	sing praises
sing someone's praises	sing the blues
sing the praises of (someone or something)	sing to
sing to sleep	sing together
singed	singe
single file	single file, in
single out	single
bar sinister	sink back
sink below	sink down
sink in	sink into