noun
old-timer; veteran; senior member
Refers to a person who has been in a group, company, or field for a long time. Often carries a nuance of experience and sometimes stubbornness.
彼はこの会社の古株で、もう二十年も働いている。
He is an old-timer at this company, having worked here for twenty years.
古株の社員たちは新しいやり方
Veteran employees sometimes resist new methods.
noun
old stump; old roots
Original literal meaning: an old tree stump or roots. Now mostly used in figurative contexts or when discussing gardening/forestry.
庭の古株を掘り起こすのは大変だ。
Digging up the old stump in the garden is hard work.