1. Breathing out; exhalation; exspirium.
2. The end of durability, lifetime, shelftime, warranty, storability, or another time interval.
I agree that we see some mushroomoid twice on the right - or at least I don't foresee any other interpretation of those fungus-like shapes at this point. But I would probably interpret the meaning a little differently: There's obviously an hourglass in the middle. That is, we see a reference to the passing time - or to some kind of temporal limitation, constraint, boundaries, predestination, exspiration of some time limit, deadline. The flow of time seems to be the central motif to which all the other four glyphs connect. (Context: Dr∙ Barton is trying to interpret a mysterious sign that appeared on a door of a walled-off secret room. Source: J∙ Okram - The Mystery of the Rammed Key.)