bumble
🇺🇸
/ˈbʌmbl/
🇬🇧
/ˈbʌmbl/
to move or act in a clumsy or confused way
He bumbled through his presentation, losing his place several times.
彼は自分のプレゼンテーションをつまずきながら進め、何度か話の流れを失った。