My quizzical pondering

I must bookmark this idea, I decided to memorize one idiom in Icelandic each day. Today's was "Rúsínan í pysldanum." Or the raisin at the end of a hotdogs 🌭 🤔.  Cue tge wheels that generate ideas in my head, I started to wonder if common idioms in Icelandic were idiom in Old Norse. Guess that will remain a musing.