What is the meaning of Trin?

three

three

alternative form of trinn

step

stair

rung

grade

stage

three

obsolete form of tren

to treat

to manage, to handle

to cultivate (land)

to handle (physically), to manipulate, to wield (a weapon or tool)

to dress (meat for cooking)

to tan (hides)

battle

Source: wiktionary.org