Chirup or Chirrup: How To spell?
The word Chirup is misspelled against Chirrup, a noun meaning "The act of chirping; a chirp."
Chirrup has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings chi & up which should not be misspelled with single 'R'
Wrong Spelling:  chi-r-up  Correct Spelling:  chi-rr-up 
Check more misspelled words of Chirrup to spell it correct.