From the cavernous jaws issued a hissing sound of a volume equal to the escaping steam from the safety-valves
of half a dozen locomotives, and then the creature came for the man.
Swearing is the safety-valve
through which the bad temper that might otherwise do serious internal injury to his mental mechanism escapes in harmless vaporing.
Rogojin, too, seemed to have taken up the conversation with unusual alacrity it appeared that he was still in a considerable state of excitement, if not absolutely feverish, and was in real need of someone to talk to for the mere sake of talking, as safety-valve
to his agitation.
Tim, taking the hint, stifled his indignation as well as he could, and suffered it to escape through his spectacles, with the additional safety-valve
of a short hysterical laugh now and then, which seemed to relieve him mightily.
One day I said to him when there was nobody by and he had been talking to me angrily about his wrongs, 'If this practice is a safety-valve
, comrade, well and good; but I don't altogether like your being so bent upon it in your present state of mind; I'd rather you took to something else.
Shakspere suggests as explanations (motivation) for it, first that it serves as a safety-valve
for Hamlet's emotions (is this an adequate reason?