[saghm]

It's a verb used to describe multiple people lamenting the same bad circumstance, with the idea that it's made slightly less bad by the experience of having to go through it together rather than alone. The phrase "misery loves company" is somewhat common in English, and while it's more often used to describe situations where one person feels bad and acts out to make others feel bad as a coping mechanism, the roots of the word are pretty recognizable in it; "co-misery", as in "we're miserable in this together".