Where does “macerescens” come from?

macerescens (Latin) comes from Latin maceresco, from Latin Macer, from Proto-Italic makros, from Proto-Indo-European mh₂ḱrós, from Proto-Indo-European meh₂ḱ- — to raise, increase; long.

Definitions

Ancestry of “macerescens”, step by step

Step	Language	Word	Meaning
1	Latin	maceresco	I soften, make tender
2	Latin	Macer	lean, skinny, meager
3	Proto-Italic	makros	—
4	Proto-Indo-European	mh₂ḱrós	lean, meager
5	Proto-Indo-European	meh₂ḱ-	to raise, increase; long

Every word from Proto-Indo-European meh₂ḱ- →Every word from Proto-Indo-European mh₂ḱrós →Every word from Proto-Italic makros →