sig ‧ nal ‧ ler /ˈsɪɡn ə lə $ -ər/ BrE AmE noun [countable] British English
[ Word Family: noun : ↑ sign , ↑ signal , ↑ signatory , ↑ signature , ↑ signing , ↑ signaller ; verb : ↑ sign , ↑ signal ; adverb : ↑ signally ; adjective : signed ≠ ↑ unsigned ]
a ↑ signalman (2)