[n] a small wave on the surface of a liquid
[n] (electronics) an oscillation of small amplitude imposed on top of a steady value
[v] stir up (water) so as to form ripples
[v] flow in an irregular current with a bubbling noise, as of water; "babbling brooks"
babble, bubble, burble, cockle, guggle, gurgle, riffle, riffle, rippling, ruffle, undulate, wavelet