trunk	torso
a bout of laughter	a sudden outburst of laugh
to lose its oommph	be without energy/enthusiasm
to store negative emotions	to bottle up ypur feelings
a bigotry	the attitudes, behaviour of a bigot: prejudice, intolerance
a joke-teller	a person who makes people laugh by telling jokes
a tear duct	a short tube through which tears drain into the nose
an incongruity	instability, inconsistency
a boisterous guffaw	loud laugh
a sedate giggles	quiet laugh
a contagious laughter	laugh that spreads from one person to another
a pent up emotion	fellings that you cannot express
a conciliatory gesture	actions or words for making sb feel calm
involuntary	done without thinking, intention or control
variation	a thing that is different from other things in the same general group
(leave sb in) predicament	inconvinient situation
larynx	the area at the top of the throat that contains the vocal cords
lessen	shorten
gasp	to take a quick deep breath, especially because you are surprised or in pain
gelotology	a study of laughter and its effects on the body, from a psychological and physiological perspective
mind-numbing (medication)	that makes you feel extremely boring
made-to scale	precisely
to pass the buck	put the blame to sb else
a full head of steam	have energy to quickly make progress
to boom out	make a deep hollow sosund
to fidget around	to wiggle and twitch nervously
to bid one's time	to wait patiently
to let sth slip	to reveal secret carelessly or by accident
limber sb or sth up	make sb or sth more flexible or loose
to lure out	help sb to escape