多亏 (duō kuī) — (verb) thanks to; to have (someone/something) to thank for (a positive outcome); luckily

Two or more meaningful parts placed together so that their meanings combine into a new one.

多 originally showed two pieces of meat placed together; the repeated meat shape gives the sense of many.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 虧; 亏 is its simplified writing.

The traditional form 虧 pairs 雐, a sound part, with 亏, a part meaning exhale. The simplified 亏 is a later abbreviation.