One thing to grumble (murmur) means is to complain about something in a "bad-tempered way. It like a low rumbling sound (like thunder in the distance). We all have heard someone go on and on complaining and next thing you know they have worked themselves up into an angry fit or something close. Here the thing though, we all have a choice in every situation; one is to find away to rejoice and watch our mood and response get better or two- grumble and complain and watch things just get worse for us.
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