It's a (present progressive) verb.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
My heart was churning like a tempest in a teacup. Who is churning your butter?
Churning is the preparation of butter from milk.
Chewing and mouth movements are part of mechanical digestion.
That would be the stomach.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
My stomach was churning after eating that spicy Mexican food.
Sashay is a verb. It means to walk in an exaggerated, showy manner, often with hip swaying.
"Did not" or "didn't" is a contraction of the auxiliary verb "did" and the adverb "not," forming a negative past tense construction in English.