For good, Null and void, At a glance, Come to light

For good (চিরতরে): He left the country for good.
Null and void (বাতিল): The contract was declared null and void.
At a glance (এক পলকে/এক নজরে): He saw the whole picture at a glance.
Come to light (প্রকাশ পাওয়া): The secret finally came to light.