v. 25B6; verb
Miguelito began to sing : croon, carol, trill, troll, chant, intone, chorus.
the birds were singing : WARBLE, trill, chirp, chirrup, cheep, peep.
he sang out a greeting : CALL (OUT), cry (out), shout, yell; informal holler.
(informal) he's going to sing to the police : INFORM (ON SOMEONE); informal squeal, rat on someone, blow the whistle on someone, peach (on someone), snitch (on someone); Brit. informal grass (on someone), shop someone; N. Amer. informal finger someone, fink on someone, drop a/the dime on someone; Austral. informal pimp on someone.