sing v OED ~ v1 12 d (1833-); EDD 5. Phr sing out: to call loudly, yell; hail.
1861 Harper's xxii, 470 'Did you make out the name?' asked some one, as the voice, borne away by the wind, came faintly to us. 'No. Sing out again!' 1930 Am Speech vi, 57 [Sing] out. To call loudly; halloo. T 13-64 He cut two or three sticks and he got all shaky and shivery and finally he had to sing out to the other feller [who] was cuttin' down below him for to come and take him down, and take him home. T 172/5-65 An' he said, 'All right, boy, go forrard an'tell the---she'll do it.' So I went forrard an' sung out to 'em. I said, 'All right, boys, skipper said she'll do it.' P 108-70 Mary, sing out to Tom to come in.
