Also, let off steam. Air or relieve one's pent-up feelings by loud talk or vigorous activity. This metaphoric term refers to easing the pressure in a steam engine. eg: Joan's shouting did not mean she was angry at you; she was just blowing off steam. Note: Blow off steam的意思是通过大声喊出来或者一些活动来释放压力,也可以说是let off steam。这种说法与早期给蒸汽机减压有关。