to be experiencing a period of bad luck
不運な時期を経験している (fuun na jiki wo keiken shiteiru)
"He’s down on his luck and can’t find a job."
"彼は不運な時期を経験していて、仕事が見つからない。" (kare wa fuun na jiki wo keiken shiteite, shigoto ga mitsukaranai)
feeling extremely happy or successful
to stay mentally focused and motivated
to work late into the night
a very close and trusted friend
a small part of a much bigger problem
to reach a stage of maturity or full potential
