expression, noun
doing two things at once; wearing two hats
Idiomatic expression, often used as 二足のわらじを履く. Literally 'two pairs of straw sandals', it figuratively means holding two jobs or roles simultaneously, especially when they are different in nature.
See also: 二足のわらじを履く
彼は昼は会社員、夜はミュージシャンと、二足のわらじを履いている。
He wears two hats: an office worker by day and a musician by night.
二足のわらじは大変だが、どちらもやめたくない。
Juggling two jobs is tough, but I don't want to give up either.