I burst into tears.
Kyū ni namida ga koboretekita.
urgent; sudden; abrupt; sharp; steep; precipitous; rapid; swift; fast; emergency; crisis; hurrying; haste; (in gagaku or noh) end of a song
at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although
tear; tears; lachrymal secretion; sympathy
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
to spill; to fall out of; to overflow; to peek through; to become visible (although normally not); to escape (of a smile, tear, etc.)