to drop through

Webster's Dictionary (GCIDE)

1.From one end or side to the other; as, to pierce a thing through. [1913 Webster]

2.From beginning to end; as, to read a letter through. [1913 Webster]

3.To the end; to a conclusion; to the ultimate purpose; as, to carry a project through. [1913 Webster]

Note: Through was formerly used to form compound adjectives where we now use thorough; as, through-bred; through-lighted; through-placed, etc. [1913 Webster]

To drop through, to fall through; to come to naught; to fail.

To fall through. See under Fall, v. i. [1913 Webster] [1913 Webster]