Meaning of (अवत्वरण या मन्दन करना) avatvaran ya mandan karna in english
As verb :
decelerate Ex:  They can accelerate and decelerate faster than heavier, long-distance trains.
Suggested : to decrease the velocity of
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(अवत्वरण या मन्दन करना) avatvaran ya mandan karna
can be used as verb.. No of characters: 21 including vowels consonants matras.
Transliteration :
avatvaraNa yaa mandana karanaa