a misunderstanding between two people
二人の間の誤解 (futari no aida no gokai)
"We must have crossed wires about the meeting time."
"会議の時間について誤解があったに違いない。" (kaigi no jikan ni tsuite gokai ga atta ni chigainai)
to make a firm decision or take a strong stand on something
a very small amount compared to what is needed
to be extremely determined to defeat or punish someone
A difficult task or challenge.
the amount of time before a startup runs out of money
to feel extremely happy and successful