• pop & • pop (one's) ears

• pop
6-[intransitive] if your ears pop when you are going up or down in a plane, etc., the pressure in them suddenly changes
: (비행기를 타고 올라가거나 내려갈 때처럼 기압 변화 때문에 귀가) 멍해지다



• pop (one's) ears
-informal.  To release pressure felt in one's ears by doing certain actions (such as swallowing, nose-blowing, etc.). - 프리 
e.g.) 
A: "What? Man, I really need to pop my ears." B: "Try swallowing."
Pinch your nostrils and blow through your nose—that should help to pop your ears.