Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test English Vocabulary Phrase or Idiom Meaning
Choose the correct meaning of the following phrasal verb.
Knuckle down
1
To use one's knuckles to hit something
2
To become serious about a task
3
To relieve stress by relaxing
4
More than one of the above
5
None of the above