There was a break down in the machinery. Here ‘break down’ is a/an -

• There was a reak down in the machinery. Here ‘break down’ is a/an - phrasal verb.
• Break Down 
English Meaning: 
1. (of a machine or motor vehicle) suddenly cease to function / a failure of a relationship or system/ a sudden collapse in someone's mental health etc.
Bangla Meaning: (যন্ত্রপাতির) বিকলতা/ মানসিক বৈকল্য ইত্যাদি।