sticking to one's post

Verb

stick to one's post (third-person singular simple present sticks to one's post, present participle sticking to one's post, simple past and past participle stuck to one's post)

1. To remain in a position, especially in a critical situation.
   • "You are old, William Ewart," the young man cried,
     "And life must be fleeting away,
     Yet you stick to your post, and refuse to take rest;
     Now, what is your reason I pray?"1886, Parodies of the Works of English & American Authors, page 162