fall in

Verb

fall in (third-person singular simple present falls in, present participle falling in, simple past fell in, past participle fallen in)

1. (intransitive) To collapse inwards.
   • The heavy rain caused the roof to fall in.
2. (intransitive) Of a soldier, to get into position in a rank.
   • His men resumed their muskets and fell in.1860 December – 1861 August, Charles Dickens, chapter V, in Great Expectations […], volume I, London: Chapman and Hall, […], published October 1861, →OCLC, page 68
   1. (intransitive) To take a position.
      • At that point, the Subaru fell in behind the Toyota.
3. To come to an end; to terminate; to lapse.
   • On the death of Mr. B., the annuity, which he had so long received, fell in.
4. To become operative.
   • The reversion, to which he had been nominated twenty years before, fell in.1841, Thomas Macaulay, Lord Byron and The Comic Dramatists of the Restoration