grommelen (ww):
refunfuñar(en) to murmur or mutter with discontent.
(en) to make a low growling or rumbling stomach noise., rezongar(en) to murmur or mutter with discontent.
(en) to make a low growling or rumbling stomach noise., quejarse(fr) Murmurer entre ses dents quand on est fâché.
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