What is the meaning of Shingling?

present participle and gerund of shingle

The act of covering with shingles.

Shingles, collectively; a covering made of shingles.

The process of expelling scoriae and other impurities by hammering and squeezing, in the production of wrought iron.

The increasing of the storage density of a hard disk by writing tracks that partially overlap.

Source: wiktionary.org