(of a container) to burst; to break from internal pressure / (often figuratively) to disperse/scatter with a burst / to have fun; to party / to go public; to be revealed

lo and behold

to get a big surprise; to be astonished

balloon

to be astonished, surprised, amazed, startled

child

the balloon plant; Cardiospermum halicacabum

plural of 子供: children

child's naive mind, child's juvenile mind

(offensive, Internet slang) a man whose age is greater than about thirty or forty who lives in one's child room and with one's parent(s).