to suddenly start laughing loudly
plötzlich laut lachen (plötz-lich laut lachen)
"They burst into laughter after hearing the funny story."
"Sie brachen in Lachen aus, nachdem sie die lustige Geschichte gehört hatten." (sie brachen in lachen aus, nachdem sie die lustige geschichte gehört hatten)
to isolate yourself from others to calm down
to go back and forth between two opinions or choices
to discard something that is no longer useful
to keep money so you can buy something in the future
to bring someone in to help with a task
to complete actions that were promised or scheduled