1) Beeped 2) Blew 3) Blew a horn 4) Blew a signal 5) Blew on a horn 6) Blew the bugle 7) Blew the horn 8) Blew the whistle 9) Emulated Galway 10) Honked 11) Played the horn 12) Sounded the horn 13) Sounded the whistle 14) Used a hewgag 15) Warned with a horn Found on https://www.crosswordclues.com/clue/tooted