sing
/sɪŋ/·싱·verb
to make musical sounds with the voice
Old EnglishCEFR A1
Root
Proto-Germanic '*singwan' (to sing)
Proto-Germanic *singwan → Old English singan → Modern sing
In a word
sing and song are verb–noun siblings from one root. The vowel just shifts — that's Germanic ablaut. drink/drank/drunk, run/ran — all the strong verbs inherit this ancient pattern. English has been shape-shifting its vowels for over a thousand years.
Examples
She sings beautifully.
Birds sing at dawn.
Let's sing together.
Related
singersongsingingsingalong