siclu -sil- gismu

x1 [sound source] whistles/makes whistling sound/note/tone/melody x2.

See also sance, tonga, sanga, zgike, savru.

In notes:

sance
x1 is sound produced/emitted by x2.
sanga
x1 sings/chants x2 [song/hymn/melody/melodic sounds] to audience x3.
savru
x1 is a noise/din/clamor [sensory input without useful information] to x2 via sensory channel x3.
tonga
x1 is a tone/note of frequency/pitch x2 from source x3.
zgike
x1 is music performed/produced by x2 (event).