fall in

present singular third person falls in · participle present falling in · past fell in · participle past fallen in

1. intransitiveTo collapse inwards.

   The heavy rain caused the roof to fall in.

2. intransitivegovernmentOf 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. intransitivegovernmentTo 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