Answer:
The poet's use of the word bone gives the line an ominous tone.
Step-by-step explanation:
"The Cremation of Sam McGee" by "Robert W. Service" is a poem about chilly and cold winter trip of two friends. The poem is about friendship of the speaker and his friend Sam McGee. The poem's speaker narrates a story about his friend, Sam who freezes to death on the trail.
Sam is depressed as he is freezing to death. So, the speaker agrees to do whatever Sam says. In the given lines, speaker wants to tell how awfully bone-chilling it is out there. So, the use of the word bone gives an ominous tone as something bad is going to happen.