みんなが突然笑い出した。

みんなが突然笑い出した。

Everyone burst into laughter.

みんなが突然(とつぜん)笑(わら)い出(だ)した。

Minna ga totsuzen waraidashita.

皆 (みな、みんな)

all; everyone; everybody; everything

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

突然 (とつぜん)

abrupt; sudden; unexpected; all at once

笑う (わらう)

to laugh; to smile; to sneer; to ridicule; to be dumbfounded; to be flabbergasted

Readings: トツ、カ、つ.く

Meanings: stab, protruding, thrust, pierce, prick, collision, sudden

Readings: ゼン、ネン、しか、しか.り、しか.し、さ

Meanings: sort of thing, so, if so, in that case, well

Readings: ショウ、わら.う、え.む

Meaning: laugh

Readings: シュツ、スイ、で.る、 -で、だ.す、 -だ.す、い.でる、い.だす

Meanings: exit, leave, go out, come out, put out, protrude