昨日は一日中寝ていた。

昨日は一日中寝ていた。

I slept all day yesterday.

昨日(きのう)は一(いち)日中(にちちゅう)寝(ね)ていた。

Kinō wa ichi nichichū neteita.

昨日 (きのう、さくじつ)

yesterday

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

一 (いち)

one; best; first; foremost; beginning; start; bottom string (on a shamisen, etc.)

日中 (にっちゅう、ひなか)

daytime; during the day; Sino-Japanese

寝る (ねる)

to lie down; to go to bed; to lie in bed; to sleep (lying down); to sleep (with someone, i.e. have intercourse); to lie idle

Reading: サク

Meanings: yesterday, previous

Readings: ニチ、ジツ、ひ、 -び、 -か

Meanings: day, sun, Japan, counter for days

Readings: イチ、イツ、ひと-、ひと.つ

Meanings: one, one radical (no.1)

Readings: チュウ、なか、うち、あた.る

Meanings: in, inside, middle, mean, center

Readings: シン、ね.る、ね.かす、い.ぬ、みたまや、や.める

Meanings: lie down, sleep, rest, bed, remain unsold