sing out
Verb
Meaning
To cry out, e.g. when in pain.
(nautical) To call out; yell.
To start singing.
Source: en.wiktionary.orgSynonyms
Examples
“‘Every time somebody asks you to sing out loud, you’re just going to do it.’
I have to sing out of necessity but, you know, I guess my voice has been getting stronger and stronger from all this touring and making three records in the last six years.
The run maintained at a brisk 9-minute per mile pace and required soldiers to sing out with military cadence as they ran.