my friend has relentless right ear pounding too, initially diagnosed as pulsatile tinnitus, but after a CT scan was determined to be mastoiditis (though she cannot remember having an ear infection and has no pain with the pounding). Hopefully the antibiotic will take care of it and that you are better too!
Understudy definition, to learn (a role) in order to replace the regular actor or actress when necessary. See more.
underlie (third-person singular simple present underlies, present participle underlying, simple past underlay, past participle underlain) (intransitive) To lie in a position directly beneath. A stratum of clay underlies the surface gravel. To lie under or beneath. To serve as a basis of; form the foundation of.