Meaning of (कठिन चढ़ाई) kathin chadhaee,kathin chadhai in english
As noun :
scramble Ex:  Substantively, they are people to scramble for a yes or a no
Suggested : to climb or move quickly using one's hands and feet, as down a rough incline
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(कठिन चढ़ाई) kathin chadhaee,kathin chadhai
can be used as noun.. No of characters: 10 including vowels consonants matras.
Transliteration :
kaThina cha.Dhaaii