what does trip mean?
The sobs tear at my heart until I feel physical pain. My pulse "trips". I checked dictionary. it means catch one's foot on something and stumble or fall. but I can't understand this word. what does trip mean in the context?

Question

what does trip mean?
The sobs tear at my heart until I feel physical pain. My pulse "trips". I checked dictionary. it means  catch one's foot on something and stumble or fall. but I can't understand this word. what does trip mean in the context?

Answer

"stumble" is right, but the context applies that action to the "pulse" or heartbeat. I imagine the person in context is sobbing so hard that it inhibits their normal breathing and heartrate, causing them to make that sound of sharply sucking in air that people sometimes make when they "trip" over something unexpectedly. 
Hope this helps.

Answer

Yes, that's the idea. "Stumbles."