Synonyms:
armpit, axilla, axillary_cavity, axillary_fossa
Meaning: the hollow under the arm where it is joined to the shoulder; "they were up to their armpits in water"
Usage examples
But he was not destined to go far. With a cry John seized the branch of a tree, whipped the crutch out of his armpit, and sent that uncouth missile hurtling through the air. It struck poor Tom, point foremost, and with stunning violence, right between the shoulders in the middle of his back.
He then squeezed the fingers of his horny hand close together, put it for a few minutes under his armpit, to make it sweat, as he said; and, taking it again out, drew it over a ladle filled with melted copper, some of which he skimmed off, and moved his hand backwards and forwards, very quickly, by way of ostentation.